# Struct chrono::naive::NaiveTime [−] [src]

    pub struct NaiveTime { /* fields omitted */ }

ISO 8601 time without timezone. Allows for the nanosecond precision and optional leap second representation.

# Leap Second Handling

Since 1960s, the manmade atomic clock has been so accurate that it is much more accurate than Earth’s own motion. It became desirable to define the civil time in terms of the atomic clock, but that risks the desynchronization of the civil time from Earth. To account for this, the designers of the Coordinated Universal Time (UTC) made that the UTC should be kept within 0.9 seconds of the observed Earth-bound time. When the mean solar day is longer than the ideal (86,400 seconds), the error slowly accumulates and it is necessary to add a leap second to slow the UTC down a bit. (We may also remove a second to speed the UTC up a bit, but it never happened.) The leap second, if any, follows 23:59:59 of June 30 or December 31 in the UTC.

Fast forward to the 21st century, we have seen 26 leap seconds from January 1972 to December 2015. Yes, 26 seconds. Probably you can read this paragraph within 26 seconds. But those 26 seconds, and possibly more in the future, are never predictable, and whether to add a leap second or not is known only before 6 months. Internet-based clocks (via NTP) do account for known leap seconds, but the system API normally doesn’t (and often can’t, with no network connection) and there is no reliable way to retrieve leap second information.

Chrono does not try to accurately implement leap seconds; it is impossible. Rather, it allows for leap seconds but behaves as if there are no other leap seconds. Various operations will ignore any possible leap second(s) except when any of the operands were actually leap seconds.

If you cannot tolerate this behavior, you must use a separate `TimeZone` for the International Atomic Time (TAI). TAI is like UTC but has no leap seconds, and thus slightly differs from UTC. Chrono does not yet provide such implementation, but it is planned.

## Representing Leap Seconds

The leap second is indicated via fractional seconds more than 1 second. This makes possible to treat a leap second as the prior non-leap second if you don’t care about sub-second accuracy. You should use the proper formatting to get the raw leap second.

All methods accepting fractional seconds will accept such values.

    use chrono::{NaiveDate, NaiveTime, Utc, TimeZone};

    let t = NaiveTime::from_hms_milli(8, 59, 59, 1_000);

    let dt1 = NaiveDate::from_ymd(2015, 7, 1).and_hms_micro(8, 59, 59, 1_000_000);

    let dt2 = Utc.ymd(2015, 6, 30).and_hms_nano(23, 59, 59, 1_000_000_000);

Note that the leap second can happen anytime given an appropriate time zone; 2015-07-01 01:23:60 would be a proper leap second if UTC+01:24 had existed. Practically speaking, though, by the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.

## Date And Time Arithmetics

As a concrete example, let’s assume that `03:00:60` and `04:00:60` are leap seconds. In reality, of course, leap seconds are separated by at least 6 months. We will also use some intuitive concise notations for the explanation.

`Time + Duration` (short for `NaiveTime::overflowing_add_signed`):

- `03:00:00 + 1s = 03:00:01`.
- `03:00:59 + 60s = 03:02:00`.
- `03:00:59 + 1s = 03:01:00`.
- `03:00:60 + 1s = 03:01:00`. Note that the sum is identical to the previous.
- `03:00:60 + 60s = 03:01:59`.
- `03:00:60 + 61s = 03:02:00`.
- `03:00:60.1 + 0.8s = 03:00:60.9`.

`Time - Duration` (short for `NaiveTime::overflowing_sub_signed`):

- `03:00:00 - 1s = 02:59:59`.
- `03:01:00 - 1s = 03:00:59`.
- `03:01:00 - 60s = 03:00:00`.
- `03:00:60 - 60s = 03:00:00`. Note that the result is identical to the previous.
- `03:00:60.7 - 0.4s = 03:00:60.3`.
- `03:00:60.7 - 0.9s = 03:00:59.8`.

`Time - Time` (short for `NaiveTime::signed_duration_since`):

- `04:00:00 - 03:00:00 = 3600s`.
- `03:01:00 - 03:00:00 = 60s`.
- `03:00:60 - 03:00:00 = 60s`. Note that the difference is identical to the previous.
- `03:00:60.6 - 03:00:59.4 = 1.2s`.
- `03:01:00 - 03:00:59.8 = 0.2s`.
- `03:01:00 - 03:00:60.5 = 0.5s`. Note that the difference is larger than the previous, even though the leap second clearly follows the previous whole second.
- `04:00:60.9 - 03:00:60.1 = (04:00:60.9 - 04:00:00) + (04:00:00 - 03:01:00) + (03:01:00 - 03:00:60.1) = 60.9s + 3540s + 0.9s = 3601.8s`.

In general,

- `Time + Duration` unconditionally equals to `Duration + Time`.

- `Time - Duration` unconditionally equals to `Time + (-Duration)`.

- `Time1 - Time2` unconditionally equals to `-(Time2 - Time1)`.

- Associativity does not generally hold, because `(Time + Duration1) - Duration2` no longer equals to `Time + (Duration1 - Duration2)` for two positive durations.

  - As a special case, `(Time + Duration) - Duration` also does not equal to `Time`.

  - If you can assume that all durations have the same sign, however, then the associativity holds: `(Time + Duration1) + Duration2` equals to `Time + (Duration1 + Duration2)` for two positive durations.

## Reading And Writing Leap Seconds

The “typical” leap seconds on the minute boundary are correctly handled both in the formatting and parsing. The leap second in the human-readable representation will be represented as the second part being 60, as required by ISO 8601.

    use chrono::{Utc, TimeZone};

    let dt = Utc.ymd(2015, 6, 30).and_hms_milli(23, 59, 59, 1_000);
    assert_eq!(format!("{:?}", dt), "2015-06-30T23:59:60Z");

There are hypothetical leap seconds not on the minute boundary nevertheless supported by Chrono. They are allowed for the sake of completeness and consistency; there were several “exotic” time zone offsets with fractional minutes prior to UTC after all. For such cases the human-readable representation is ambiguous and would be read back to the next non-leap second.

    use chrono::{DateTime, Utc, TimeZone};

    let dt = Utc.ymd(2015, 6, 30).and_hms_milli(23, 56, 4, 1_000);
    assert_eq!(format!("{:?}", dt), "2015-06-30T23:56:05Z");

    let dt = Utc.ymd(2015, 6, 30).and_hms(23, 56, 5);
    assert_eq!(format!("{:?}", dt), "2015-06-30T23:56:05Z");
    assert_eq!(DateTime::parse_from_rfc3339("2015-06-30T23:56:05Z").unwrap(), dt);

Since Chrono alone cannot determine any existence of leap seconds, there is absolutely no guarantee that the leap second read has actually happened.

## Implementations

### `impl NaiveTime` [src]

#### `pub fn from_hms(hour: u32, min: u32, sec: u32) -> NaiveTime` [src]

Makes a new `NaiveTime` from hour, minute and second.

No leap second is allowed here; use `NaiveTime::from_hms_*` methods with a subsecond parameter instead.

Panics on invalid hour, minute and/or second.

# Example

    use chrono::{NaiveTime, Timelike};

    let t = NaiveTime::from_hms(23, 56, 4);
    assert_eq!(t.hour(), 23);
    assert_eq!(t.minute(), 56);
    assert_eq!(t.second(), 4);
    assert_eq!(t.nanosecond(), 0);

#### `pub fn from_hms_opt(hour: u32, min: u32, sec: u32) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` from hour, minute and second.

No leap second is allowed here; use `NaiveTime::from_hms_*_opt` methods with a subsecond parameter instead.

Returns `None` on invalid hour, minute and/or second.

# Example

    use chrono::NaiveTime;

    let from_hms_opt = NaiveTime::from_hms_opt;

    assert!(from_hms_opt(0, 0, 0).is_some());
    assert!(from_hms_opt(23, 59, 59).is_some());
    assert!(from_hms_opt(24, 0, 0).is_none());
    assert!(from_hms_opt(23, 60, 0).is_none());
    assert!(from_hms_opt(23, 59, 60).is_none());

#### `pub fn from_hms_milli(hour: u32, min: u32, sec: u32, milli: u32) -> NaiveTime` [src]

Makes a new `NaiveTime` from hour, minute, second and millisecond.

The millisecond part can exceed 1,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or millisecond.

# Example

    use chrono::{NaiveTime, Timelike};

    let t = NaiveTime::from_hms_milli(23, 56, 4, 12);
    assert_eq!(t.hour(), 23);
    assert_eq!(t.minute(), 56);
    assert_eq!(t.second(), 4);
    assert_eq!(t.nanosecond(), 12_000_000);

#### `pub fn from_hms_milli_opt(
hour: u32,
min: u32,
sec: u32,
milli: u32
) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` from hour, minute, second and millisecond.

The millisecond part can exceed 1,000 in order to represent the leap second.

Returns `None` on invalid hour, minute, second and/or millisecond.

# Example

    use chrono::NaiveTime;

    let from_hmsm_opt = NaiveTime::from_hms_milli_opt;

    assert!(from_hmsm_opt(0, 0, 0, 0).is_some());
    assert!(from_hmsm_opt(23, 59, 59, 999).is_some());
    assert!(from_hmsm_opt(23, 59, 59, 1_999).is_some()); // a leap second after 23:59:59
    assert!(from_hmsm_opt(24, 0, 0, 0).is_none());
    assert!(from_hmsm_opt(23, 60, 0, 0).is_none());
    assert!(from_hmsm_opt(23, 59, 60, 0).is_none());
    assert!(from_hmsm_opt(23, 59, 59, 2_000).is_none());

#### `pub fn from_hms_micro(hour: u32, min: u32, sec: u32, micro: u32) -> NaiveTime` [src]

Makes a new `NaiveTime` from hour, minute, second and microsecond.

The microsecond part can exceed 1,000,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or microsecond.

# Example

    use chrono::{NaiveTime, Timelike};

    let t = NaiveTime::from_hms_micro(23, 56, 4, 12_345);
    assert_eq!(t.hour(), 23);
    assert_eq!(t.minute(), 56);
    assert_eq!(t.second(), 4);
    assert_eq!(t.nanosecond(), 12_345_000);

#### `pub fn from_hms_micro_opt(
hour: u32,
min: u32,
sec: u32,
micro: u32
) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` from hour, minute, second and microsecond.

The microsecond part can exceed 1,000,000 in order to represent the leap second.

Returns `None` on invalid hour, minute, second and/or microsecond.

# Example

    use chrono::NaiveTime;

    let from_hmsu_opt = NaiveTime::from_hms_micro_opt;

    assert!(from_hmsu_opt(0, 0, 0, 0).is_some());
    assert!(from_hmsu_opt(23, 59, 59, 999_999).is_some());
    assert!(from_hmsu_opt(23, 59, 59, 1_999_999).is_some()); // a leap second after 23:59:59
    assert!(from_hmsu_opt(24, 0, 0, 0).is_none());
    assert!(from_hmsu_opt(23, 60, 0, 0).is_none());
    assert!(from_hmsu_opt(23, 59, 60, 0).is_none());
    assert!(from_hmsu_opt(23, 59, 59, 2_000_000).is_none());

#### `pub fn from_hms_nano(hour: u32, min: u32, sec: u32, nano: u32) -> NaiveTime` [src]

Makes a new `NaiveTime` from hour, minute, second and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or nanosecond.

# Example

    use chrono::{NaiveTime, Timelike};

    let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
    assert_eq!(t.hour(), 23);
    assert_eq!(t.minute(), 56);
    assert_eq!(t.second(), 4);
    assert_eq!(t.nanosecond(), 12_345_678);

#### `pub fn from_hms_nano_opt(
hour: u32,
min: u32,
sec: u32,
nano: u32
) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` from hour, minute, second and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Returns `None` on invalid hour, minute, second and/or nanosecond.

# Example

    use chrono::NaiveTime;

    let from_hmsn_opt = NaiveTime::from_hms_nano_opt;

    assert!(from_hmsn_opt(0, 0, 0, 0).is_some());
    assert!(from_hmsn_opt(23, 59, 59, 999_999_999).is_some());
    assert!(from_hmsn_opt(23, 59, 59, 1_999_999_999).is_some()); // a leap second after 23:59:59
    assert!(from_hmsn_opt(24, 0, 0, 0).is_none());
    assert!(from_hmsn_opt(23, 60, 0, 0).is_none());
    assert!(from_hmsn_opt(23, 59, 60, 0).is_none());
    assert!(from_hmsn_opt(23, 59, 59, 2_000_000_000).is_none());

#### `pub fn from_num_seconds_from_midnight(secs: u32, nano: u32) -> NaiveTime` [src]

Makes a new `NaiveTime` from the number of seconds since midnight and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Panics on invalid number of seconds and/or nanosecond.

# Example

    use chrono::{NaiveTime, Timelike};

    let t = NaiveTime::from_num_seconds_from_midnight(86164, 12_345_678);
    assert_eq!(t.hour(), 23);
    assert_eq!(t.minute(), 56);
    assert_eq!(t.second(), 4);
    assert_eq!(t.nanosecond(), 12_345_678);

#### `pub fn from_num_seconds_from_midnight_opt(
secs: u32,
nano: u32
) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` from the number of seconds since midnight and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Returns `None` on invalid number of seconds and/or nanosecond.

# Example

    use chrono::NaiveTime;

    let from_nsecs_opt = NaiveTime::from_num_seconds_from_midnight_opt;

    assert!(from_nsecs_opt(0, 0).is_some());
    assert!(from_nsecs_opt(86399, 999_999_999).is_some());
    assert!(from_nsecs_opt(86399, 1_999_999_999).is_some()); // a leap second after 23:59:59
    assert!(from_nsecs_opt(86_400, 0).is_none());
    assert!(from_nsecs_opt(86399, 2_000_000_000).is_none());

#### `pub fn parse_from_str(s: &str, fmt: &str) -> ParseResult<NaiveTime>` [src]

Parses a string with the specified format string and returns a new `NaiveTime`. See the `format::strftime` module on the supported escape sequences.

# Example

    use chrono::NaiveTime;

    let parse_from_str = NaiveTime::parse_from_str;

    assert_eq!(parse_from_str("23:56:04", "%H:%M:%S"),
               Ok(NaiveTime::from_hms(23, 56, 4)));
    assert_eq!(parse_from_str("pm012345.6789", "%p%I%M%S%.f"),
               Ok(NaiveTime::from_hms_micro(13, 23, 45, 678_900)));

Date and offset is ignored for the purpose of parsing.

    assert_eq!(parse_from_str("2014-5-17T12:34:56+09:30", "%Y-%m-%dT%H:%M:%S%z"),
               Ok(NaiveTime::from_hms(12, 34, 56)));

Leap seconds are correctly handled by treating any time of the form `hh:mm:60` as a leap second. (This equally applies to the formatting, so the round trip is possible.)

    assert_eq!(parse_from_str("08:59:60.123", "%H:%M:%S%.f"),
               Ok(NaiveTime::from_hms_milli(8, 59, 59, 1_123)));

Missing seconds are assumed to be zero, but out-of-bound times or insufficient fields are errors otherwise.

    assert_eq!(parse_from_str("7:15", "%H:%M"),
               Ok(NaiveTime::from_hms(7, 15, 0)));

    assert!(parse_from_str("04m33s", "%Mm%Ss").is_err());
    assert!(parse_from_str("12", "%H").is_err());
    assert!(parse_from_str("17:60", "%H:%M").is_err());
    assert!(parse_from_str("24:00:00", "%H:%M:%S").is_err());

All parsed fields should be consistent to each other, otherwise it’s an error. Here `%H` is for 24-hour clocks, unlike `%I`, and thus can be independently determined without AM/PM.

    assert!(parse_from_str("13:07 AM", "%H:%M %p").is_err());

#### `pub fn overflowing_add_signed(&self, rhs: OldDuration) -> (NaiveTime, i64)` [src]

Adds given `Duration` to the current time, and also returns the number of seconds in the integral number of days ignored from the addition. (We cannot return `Duration` because it is subject to overflow or underflow.)

# Example

    use chrono::{Duration, NaiveTime};

    let from_hms = NaiveTime::from_hms;

    assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(11)),
               (from_hms(14, 4, 5), 0));
    assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(23)),
               (from_hms(2, 4, 5), 86_400));
    assert_eq!(from_hms(3, 4, 5).overflowing_add_signed(Duration::hours(-7)),
               (from_hms(20, 4, 5), -86_400));

#### `pub fn overflowing_sub_signed(&self, rhs: OldDuration) -> (NaiveTime, i64)` [src]

Subtracts given `Duration` from the current time, and also returns the number of seconds in the integral number of days ignored from the subtraction. (We cannot return `Duration` because it is subject to overflow or underflow.)

# Example

    use chrono::{Duration, NaiveTime};

    let from_hms = NaiveTime::from_hms;

    assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(2)),
               (from_hms(1, 4, 5), 0));
    assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(17)),
               (from_hms(10, 4, 5), 86_400));
    assert_eq!(from_hms(3, 4, 5).overflowing_sub_signed(Duration::hours(-22)),
               (from_hms(1, 4, 5), -86_400));

#### `pub fn signed_duration_since(self, rhs: NaiveTime) -> OldDuration` [src]

Subtracts another `NaiveTime` from the current time. Returns a `Duration` within +/- 1 day. This does not overflow or underflow at all.

As a part of Chrono’s leap second handling, the subtraction assumes that there is no leap second ever, except when any of the `NaiveTime`s themselves represents a leap second in which case the assumption becomes that there are exactly one (or two) leap second(s) ever.

# Example

    use chrono::{Duration, NaiveTime};

    let from_hmsm = NaiveTime::from_hms_milli;
    let since = NaiveTime::signed_duration_since;

    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 7, 900)),
               Duration::zero());
    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 7, 875)),
               Duration::milliseconds(25));
    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 6, 925)),
               Duration::milliseconds(975));
    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 5, 0, 900)),
               Duration::seconds(7));
    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(3, 0, 7, 900)),
               Duration::seconds(5 * 60));
    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(0, 5, 7, 900)),
               Duration::seconds(3 * 3600));
    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(4, 5, 7, 900)),
               Duration::seconds(-3600));
    assert_eq!(since(from_hmsm(3, 5, 7, 900), from_hmsm(2, 4, 6, 800)),
               Duration::seconds(3600 + 60 + 1) + Duration::milliseconds(100));

Leap seconds are handled, but the subtraction assumes that there were no other leap seconds happened.

    assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(3, 0, 59, 0)),
               Duration::seconds(1));
    assert_eq!(since(from_hmsm(3, 0, 59, 1_500), from_hmsm(3, 0, 59, 0)),
               Duration::milliseconds(1500));
    assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(3, 0, 0, 0)),
               Duration::seconds(60));
    assert_eq!(since(from_hmsm(3, 0, 0, 0), from_hmsm(2, 59, 59, 1_000)),
               Duration::seconds(1));
    assert_eq!(since(from_hmsm(3, 0, 59, 1_000), from_hmsm(2, 59, 59, 1_000)),
               Duration::seconds(61));

#### `pub fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I> where
I: Iterator<Item = B> + Clone,
B: Borrow<Item<'a>>,` [src]

Formats the time with the specified formatting items. Otherwise it is the same as the ordinary `format` method.

The `Iterator` of items should be `Clone`able, since the resulting `DelayedFormat` value may be formatted multiple times.

# Example

    use chrono::NaiveTime;
    use chrono::format::strftime::StrftimeItems;

    let fmt = StrftimeItems::new("%H:%M:%S");
    let t = NaiveTime::from_hms(23, 56, 4);
    assert_eq!(t.format_with_items(fmt.clone()).to_string(), "23:56:04");
    assert_eq!(t.format("%H:%M:%S").to_string(),             "23:56:04");

The resulting `DelayedFormat` can be formatted directly via the `Display` trait.

    assert_eq!(format!("{}", t.format_with_items(fmt)), "23:56:04");

#### `pub fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>>` [src]

Formats the time with the specified format string. See the `format::strftime` module on the supported escape sequences.

This returns a `DelayedFormat`, which gets converted to a string only when actual formatting happens. You may use the `to_string` method to get a `String`, or just feed it into `print!` and other formatting macros. (In this way it avoids the redundant memory allocation.)

A wrong format string does not issue an error immediately. Rather, converting or formatting the `DelayedFormat` fails. You are recommended to immediately use `DelayedFormat` for this reason.

# Example

    use chrono::NaiveTime;

    let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
    assert_eq!(t.format("%H:%M:%S").to_string(), "23:56:04");
    assert_eq!(t.format("%H:%M:%S%.6f").to_string(), "23:56:04.012345");
    assert_eq!(t.format("%-I:%M %p").to_string(), "11:56 PM");

The resulting `DelayedFormat` can be formatted directly via the `Display` trait.

    assert_eq!(format!("{}", t.format("%H:%M:%S")), "23:56:04");
    assert_eq!(format!("{}", t.format("%H:%M:%S%.6f")), "23:56:04.012345");
    assert_eq!(format!("{}", t.format("%-I:%M %p")), "11:56 PM");

## Trait Implementations

### `impl Add<Duration> for NaiveTime` [src]

An addition of `Duration` to `NaiveTime` wraps around and never overflows or underflows. In particular the addition ignores integral number of days.

As a part of Chrono’s leap second handling, the addition assumes that there is no leap second ever, except when the `NaiveTime` itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

# Example

    use chrono::{Duration, NaiveTime};

    let from_hmsm = NaiveTime::from_hms_milli;

    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::zero(),                  from_hmsm(3, 5, 7, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(1),              from_hmsm(3, 5, 8, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(-1),             from_hmsm(3, 5, 6, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(60 + 4),         from_hmsm(3, 6, 11, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(7*60*60 - 6*60), from_hmsm(9, 59, 7, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::milliseconds(80),        from_hmsm(3, 5, 7, 80));
    assert_eq!(from_hmsm(3, 5, 7, 950) + Duration::milliseconds(280),     from_hmsm(3, 5, 8, 230));
    assert_eq!(from_hmsm(3, 5, 7, 950) + Duration::milliseconds(-980),    from_hmsm(3, 5, 6, 970));

The addition wraps around.

    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(22*60*60), from_hmsm(1, 5, 7, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::seconds(-8*60*60), from_hmsm(19, 5, 7, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) + Duration::days(800),         from_hmsm(3, 5, 7, 0));

Leap seconds are handled, but the addition assumes that it is the only leap second happened.

    let leap = from_hmsm(3, 5, 59, 1_300);
    assert_eq!(leap + Duration::zero(),             from_hmsm(3, 5, 59, 1_300));
    assert_eq!(leap + Duration::milliseconds(-500), from_hmsm(3, 5, 59, 800));
    assert_eq!(leap + Duration::milliseconds(500),  from_hmsm(3, 5, 59, 1_800));
    assert_eq!(leap + Duration::milliseconds(800),  from_hmsm(3, 6, 0, 100));
    assert_eq!(leap + Duration::seconds(10),        from_hmsm(3, 6, 9, 300));
    assert_eq!(leap + Duration::seconds(-10),       from_hmsm(3, 5, 50, 300));
    assert_eq!(leap + Duration::days(1),            from_hmsm(3, 5, 59, 300));

#### `type Output = NaiveTime`

The resulting type after applying the `+` operator.

#### `fn add(self, rhs: OldDuration) -> NaiveTime` [src]

Performs the `+` operation. Read more

### `impl Add<FixedOffset> for NaiveTime` [src]

#### `type Output = NaiveTime`

The resulting type after applying the `+` operator.

#### `fn add(self, rhs: FixedOffset) -> NaiveTime` [src]

Performs the `+` operation. Read more

### `impl AddAssign<Duration> for NaiveTime` [src]

#### `fn add_assign(&mut self, rhs: OldDuration)` [src]

Performs the `+=` operation. Read more

### `impl Clone for NaiveTime` [src]

#### `fn clone(&self) -> NaiveTime` [src]

Returns a copy of the value. Read more

#### `pub fn clone_from(&mut self, source: &Self)`1.0.0 [src]

Performs copy-assignment from `source`. Read more

### `impl Copy for NaiveTime` [src]

### `impl Debug for NaiveTime` [src]

The `Debug` output of the naive time `t` is the same as `t.format("%H:%M:%S%.f")`.

The string printed can be readily parsed via the `parse` method on `str`.

It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn’t matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)

# Example

    use chrono::NaiveTime;

    assert_eq!(format!("{:?}", NaiveTime::from_hms(23, 56, 4)),              "23:56:04");
    assert_eq!(format!("{:?}", NaiveTime::from_hms_milli(23, 56, 4, 12)),    "23:56:04.012");
    assert_eq!(format!("{:?}", NaiveTime::from_hms_micro(23, 56, 4, 1234)),  "23:56:04.001234");
    assert_eq!(format!("{:?}", NaiveTime::from_hms_nano(23, 56, 4, 123456)), "23:56:04.000123456");

Leap seconds may also be used.

    assert_eq!(format!("{:?}", NaiveTime::from_hms_milli(6, 59, 59, 1_500)), "06:59:60.500");

#### `fn fmt(&self, f: &mut Formatter<'_>) -> Result` [src]

Formats the value using the given formatter. Read more

### `impl Display for NaiveTime` [src]

The `Display` output of the naive time `t` is the same as `t.format("%H:%M:%S%.f")`.

The string printed can be readily parsed via the `parse` method on `str`.

It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn’t matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)

# Example

    use chrono::NaiveTime;

    assert_eq!(format!("{}", NaiveTime::from_hms(23, 56, 4)),              "23:56:04");
    assert_eq!(format!("{}", NaiveTime::from_hms_milli(23, 56, 4, 12)),    "23:56:04.012");
    assert_eq!(format!("{}", NaiveTime::from_hms_micro(23, 56, 4, 1234)),  "23:56:04.001234");
    assert_eq!(format!("{}", NaiveTime::from_hms_nano(23, 56, 4, 123456)), "23:56:04.000123456");

Leap seconds may also be used.

    assert_eq!(format!("{}", NaiveTime::from_hms_milli(6, 59, 59, 1_500)), "06:59:60.500");

#### `fn fmt(&self, f: &mut Formatter<'_>) -> Result` [src]

Formats the value using the given formatter. Read more

### `impl Eq for NaiveTime` [src]

### `impl FromStr for NaiveTime` [src]

Parsing a `str` into a `NaiveTime` uses the same format, `%H:%M:%S%.f`, as in `Debug` and `Display`.

# Example

    use chrono::NaiveTime;

    let t = NaiveTime::from_hms(23, 56, 4);
    assert_eq!("23:56:04".parse::<NaiveTime>(), Ok(t));

    let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
    assert_eq!("23:56:4.012345678".parse::<NaiveTime>(), Ok(t));

    let t = NaiveTime::from_hms_nano(23, 59, 59, 1_234_567_890); // leap second
    assert_eq!("23:59:60.23456789".parse::<NaiveTime>(), Ok(t));

    assert!("foo".parse::<NaiveTime>().is_err());

#### `type Err = ParseError`

The associated error which can be returned from parsing.

#### `fn from_str(s: &str) -> ParseResult<NaiveTime>` [src]

Parses a string `s` to return a value of this type. Read more

### `impl Hash for NaiveTime` [src]

`NaiveTime` can be used as a key to the hash maps (in principle).

Practically this also takes account of fractional seconds, so it is not recommended. (For the obvious reason this also distinguishes leap seconds from non-leap seconds.)

#### `fn hash<H: Hasher>(&self, state: &mut H)` [src]

Feeds this value into the given `Hasher`. Read more

#### `pub fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,` 1.3.0 [src]

Feeds a slice of this type into the given `Hasher`. Read more

### `impl Ord for NaiveTime` [src]

#### `fn cmp(&self, other: &NaiveTime) -> Ordering` [src]

This method returns an `Ordering` between `self` and `other`. Read more

#### `#[must_use]pub fn max(self, other: Self) -> Self` 1.21.0 [src]

Compares and returns the maximum of two values. Read more

#### `#[must_use]pub fn min(self, other: Self) -> Self` 1.21.0 [src]

Compares and returns the minimum of two values. Read more

#### `#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self` 1.50.0 [src]

Restrict a value to a certain interval. Read more

### `impl PartialEq<NaiveTime> for NaiveTime` [src]

#### `fn eq(&self, other: &NaiveTime) -> bool` [src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &NaiveTime) -> bool` [src]

This method tests for `!=`.

### `impl PartialOrd<NaiveTime> for NaiveTime` [src]

#### `fn partial_cmp(&self, other: &NaiveTime) -> Option<Ordering>` [src]

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `#[must_use]pub fn lt(&self, other: &Rhs) -> bool` 1.0.0 [src]

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `#[must_use]pub fn le(&self, other: &Rhs) -> bool` 1.0.0 [src]

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `#[must_use]pub fn gt(&self, other: &Rhs) -> bool` 1.0.0 [src]

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `#[must_use]pub fn ge(&self, other: &Rhs) -> bool` 1.0.0 [src]

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl StructuralEq for NaiveTime` [src]

### `impl StructuralPartialEq for NaiveTime` [src]

### `impl Sub<Duration> for NaiveTime` [src]

A subtraction of `Duration` from `NaiveTime` wraps around and never overflows or underflows. In particular the addition ignores integral number of days. It is the same as the addition with a negated `Duration`.

As a part of Chrono’s leap second handling, the addition assumes that there is no leap second ever, except when the `NaiveTime` itself represents a leap second in which case the assumption becomes that there is exactly a single leap second ever.

# Example

    use chrono::{Duration, NaiveTime};

    let from_hmsm = NaiveTime::from_hms_milli;

    assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::zero(),                  from_hmsm(3, 5, 7, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(1),              from_hmsm(3, 5, 6, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(60 + 5),         from_hmsm(3, 4, 2, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(2*60*60 + 6*60), from_hmsm(0, 59, 7, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::milliseconds(80),        from_hmsm(3, 5, 6, 920));
    assert_eq!(from_hmsm(3, 5, 7, 950) - Duration::milliseconds(280),     from_hmsm(3, 5, 7, 670));

The subtraction wraps around.

    assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::seconds(8*60*60), from_hmsm(19, 5, 7, 0));
    assert_eq!(from_hmsm(3, 5, 7, 0) - Duration::days(800),        from_hmsm(3, 5, 7, 0));

Leap seconds are handled, but the subtraction assumes that it is the only leap second happened.

    let leap = from_hmsm(3, 5, 59, 1_300);
    assert_eq!(leap - Duration::zero(),            from_hmsm(3, 5, 59, 1_300));
    assert_eq!(leap - Duration::milliseconds(200), from_hmsm(3, 5, 59, 1_100));
    assert_eq!(leap - Duration::milliseconds(500), from_hmsm(3, 5, 59, 800));
    assert_eq!(leap - Duration::seconds(60),       from_hmsm(3, 5, 0, 300));
    assert_eq!(leap - Duration::days(1),           from_hmsm(3, 6, 0, 300));

#### `type Output = NaiveTime`

The resulting type after applying the `-` operator.

#### `fn sub(self, rhs: OldDuration) -> NaiveTime` [src]

Performs the `-` operation. Read more

### `impl Sub<FixedOffset> for NaiveTime` [src]

#### `type Output = NaiveTime`

The resulting type after applying the `-` operator.

#### `fn sub(self, rhs: FixedOffset) -> NaiveTime` [src]

Performs the `-` operation. Read more

### `impl Sub<NaiveTime> for NaiveTime` [src]

Subtracts another `NaiveTime` from the current time. Returns a `Duration` within +/- 1 day. This does not overflow or underflow at all.

As a part of Chrono’s leap second handling, the subtraction assumes that there is no leap second ever, except when any of the `NaiveTime`s themselves represents a leap second in which case the assumption becomes that there are exactly one (or two) leap second(s) ever.

The implementation is a wrapper around `NaiveTime::signed_duration_since`.

# Example

    use chrono::{Duration, NaiveTime};

    let from_hmsm = NaiveTime::from_hms_milli;

    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 7, 900), Duration::zero());
    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 7, 875), Duration::milliseconds(25));
    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 6, 925), Duration::milliseconds(975));
    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 5, 0, 900), Duration::seconds(7));
    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(3, 0, 7, 900), Duration::seconds(5 * 60));
    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(0, 5, 7, 900), Duration::seconds(3 * 3600));
    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(4, 5, 7, 900), Duration::seconds(-3600));
    assert_eq!(from_hmsm(3, 5, 7, 900) - from_hmsm(2, 4, 6, 800),
               Duration::seconds(3600 + 60 + 1) + Duration::milliseconds(100));

Leap seconds are handled, but the subtraction assumes that there were no other leap seconds happened.

    assert_eq!(from_hmsm(3, 0, 59, 1_000) - from_hmsm(3, 0, 59, 0), Duration::seconds(1));
    assert_eq!(from_hmsm(3, 0, 59, 1_500) - from_hmsm(3, 0, 59, 0),
               Duration::milliseconds(1500));
    assert_eq!(from_hmsm(3, 0, 59, 1_000) - from_hmsm(3, 0, 0, 0), Duration::seconds(60));
    assert_eq!(from_hmsm(3, 0, 0, 0) - from_hmsm(2, 59, 59, 1_000), Duration::seconds(1));
    assert_eq!(from_hmsm(3, 0, 59, 1_000) - from_hmsm(2, 59, 59, 1_000),
               Duration::seconds(61));

#### `type Output = OldDuration`

The resulting type after applying the `-` operator.

#### `fn sub(self, rhs: NaiveTime) -> OldDuration` [src]

Performs the `-` operation. Read more

### `impl SubAssign<Duration> for NaiveTime` [src]

#### `fn sub_assign(&mut self, rhs: OldDuration)` [src]

Performs the `-=` operation. Read more

### `impl Timelike for NaiveTime` [src]

#### `fn hour(&self) -> u32` [src]

Returns the hour number from 0 to 23.

# Example

    use chrono::{NaiveTime, Timelike};

    assert_eq!(NaiveTime::from_hms(0, 0, 0).hour(), 0);
    assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).hour(), 23);

#### `fn minute(&self) -> u32` [src]

Returns the minute number from 0 to 59.

# Example

    use chrono::{NaiveTime, Timelike};

    assert_eq!(NaiveTime::from_hms(0, 0, 0).minute(), 0);
    assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).minute(), 56);

#### `fn second(&self) -> u32` [src]

Returns the second number from 0 to 59.

# Example

    use chrono::{NaiveTime, Timelike};

    assert_eq!(NaiveTime::from_hms(0, 0, 0).second(), 0);
    assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).second(), 4);

This method never returns 60 even when it is a leap second. (Why?) Use the proper formatting method to get a human-readable representation.

    let leap = NaiveTime::from_hms_milli(23, 59, 59, 1_000);
    assert_eq!(leap.second(), 59);
    assert_eq!(leap.format("%H:%M:%S").to_string(), "23:59:60");

#### `fn nanosecond(&self) -> u32` [src]

Returns the number of nanoseconds since the whole non-leap second. The range from 1,000,000,000 to 1,999,999,999 represents the leap second.

# Example

    use chrono::{NaiveTime, Timelike};

    assert_eq!(NaiveTime::from_hms(0, 0, 0).nanosecond(), 0);
    assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).nanosecond(), 12_345_678);

Leap seconds may have seemingly out-of-range return values. You can reduce the range with `time.nanosecond() % 1_000_000_000`, or use the proper formatting method to get a human-readable representation.

    let leap = NaiveTime::from_hms_milli(23, 59, 59, 1_000);
    assert_eq!(leap.nanosecond(), 1_000_000_000);
    assert_eq!(leap.format("%H:%M:%S%.9f").to_string(), "23:59:60.000000000");

#### `fn with_hour(&self, hour: u32) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` with the hour number changed.

Returns `None` when the resulting `NaiveTime` would be invalid.

# Example

    use chrono::{NaiveTime, Timelike};

    let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
    assert_eq!(dt.with_hour(7), Some(NaiveTime::from_hms_nano(7, 56, 4, 12_345_678)));
    assert_eq!(dt.with_hour(24), None);

#### `fn with_minute(&self, min: u32) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` with the minute number changed.

Returns `None` when the resulting `NaiveTime` would be invalid.

# Example

    use chrono::{NaiveTime, Timelike};

    let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
    assert_eq!(dt.with_minute(45), Some(NaiveTime::from_hms_nano(23, 45, 4, 12_345_678)));
    assert_eq!(dt.with_minute(60), None);

#### `fn with_second(&self, sec: u32) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` with the second number changed.

Returns `None` when the resulting `NaiveTime` would be invalid. As with the `second` method, the input range is restricted to 0 through 59.

# Example

    use chrono::{NaiveTime, Timelike};

    let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
    assert_eq!(dt.with_second(17), Some(NaiveTime::from_hms_nano(23, 56, 17, 12_345_678)));
    assert_eq!(dt.with_second(60), None);

#### `fn with_nanosecond(&self, nano: u32) -> Option<NaiveTime>` [src]

Makes a new `NaiveTime` with nanoseconds since the whole non-leap second changed.

Returns `None` when the resulting `NaiveTime` would be invalid. As with the `nanosecond` method, the input range can exceed 1,000,000,000 for leap seconds.

# Example

    use chrono::{NaiveTime, Timelike};

    let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
    assert_eq!(dt.with_nanosecond(333_333_333),
               Some(NaiveTime::from_hms_nano(23, 56, 4, 333_333_333)));
    assert_eq!(dt.with_nanosecond(2_000_000_000), None);

Leap seconds can theoretically follow any whole second. The following would be a proper leap second at the time zone offset of UTC-00:03:57 (there are several historical examples comparable to this “non-sense” offset), and therefore is allowed.

    assert_eq!(dt.with_nanosecond(1_333_333_333),
               Some(NaiveTime::from_hms_nano(23, 56, 4, 1_333_333_333)));

#### `fn num_seconds_from_midnight(&self) -> u32` [src]

Returns the number of non-leap seconds past the last midnight.

# Example

    use chrono::{NaiveTime, Timelike};

    assert_eq!(NaiveTime::from_hms(1, 2, 3).num_seconds_from_midnight(),
               3723);
    assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).num_seconds_from_midnight(),
               86164);
    assert_eq!(NaiveTime::from_hms_milli(23, 59, 59, 1_000).num_seconds_from_midnight(),
               86399);

#### `fn hour12(&self) -> (bool, u32)` [src]

Returns the hour number from 1 to 12 with a boolean flag, which is false for AM and true for PM. Read more

## Auto Trait Implementations

### `impl RefUnwindSafe for NaiveTime`

### `impl Send for NaiveTime`

### `impl Sync for NaiveTime`

### `impl Unpin for NaiveTime`

### `impl UnwindSafe for NaiveTime`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &T` [src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut T` [src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T` [src]

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `pub fn to_owned(&self) -> T` [src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `pub fn clone_into(&self, target: &mut T)` [src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into`)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl<T> ToString for T where
T: Display + ?Sized,` [src]

#### `pub default fn to_string(&self) -> String` [src]

Converts the given value to a `String`. Read more

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.