Documentation
¶
Overview ¶
Package time provides functionality for measuring and displaying time.
The calendrical calculations always assume a Gregorian calendar, with no leap seconds.
Index ¶
- Constants
- Variables
- type DST
- type Duration
- type Location
- type Month
- type Time
- func (t Time) Add(d Duration) Time
- func (t Time) AddDate(years int, months int, days int) Time
- func (t Time) After(u Time) bool
- func (t Time) Before(u Time) bool
- func (t Time) Clock() (hour, min, sec int)
- func (t Time) Date() (year int, month Month, day int)
- func (t Time) Day() int
- func (t Time) Equal(u Time) bool
- func (t Time) Hour() int
- func (t Time) ISOWeek() (year, week int)
- func (t Time) In(loc *Location) Time
- func (t Time) IsZero() bool
- func (t Time) Local() Time
- func (t Time) Location() *Location
- func (t Time) Minute() int
- func (t Time) Month() Month
- func (t Time) Nanosecond() int
- func (t Time) Round(d Duration) Time
- func (t Time) Second() int
- func (t Time) Sub(u Time) Duration
- func (t Time) Truncate(d Duration) Time
- func (t Time) UTC() Time
- func (t Time) Unix() int64
- func (t Time) UnixNano() int64
- func (t Time) Weekday() Weekday
- func (t Time) Year() int
- func (t Time) YearDay() int
- func (t Time) Zone() (name string, offset int)
- type Weekday
- type Zone
Constants ¶
const ( Nanosecond Duration = 1 Microsecond = 1000 * Nanosecond Millisecond = 1000 * Microsecond Second = 1000 * Millisecond Minute = 60 * Second Hour = 60 * Minute )
Common durations. There is no definition for units of Day or larger to avoid confusion across daylight savings time zone transitions.
To count the number of units in a Duration, divide:
second := time.Second fmt.Print(int64(second/time.Millisecond)) // prints 1000
To convert an integer number of units to a Duration, multiply:
seconds := 10 fmt.Print(time.Duration(seconds)*time.Second) // prints 10s
Variables ¶
var Local = &utcLoc
Local is local location.
var (
UTC = &utcLoc
)
Functions ¶
This section is empty.
Types ¶
type DST ¶
DST describes daylight saving time zone. 25 least significant bits of Start and End contain seconds from begining of year to the month-weekday-hour at which the DST starts/ends, assuming that the year is not a leap year and its first day is Monday. 7 most significant bits of Start and End contain margin,// a number of days that weekdays can be shifted back to do not introduce new last weekday at end of month or to do not lose first weekday at beginning of month.
type Duration ¶
type Duration int64
A Duration represents the elapsed time between two instants as an int64 nanosecond count. The representation limits the largest representable duration to approximately 290 years.
func (Duration) Nanoseconds ¶
Nanoseconds returns the duration as an integer nanosecond count.
func (Duration) String ¶
String returns a string representing the duration in the form "72h3m0.5s". Leading zero units are omitted. As a special case, durations less than one second format use a smaller unit (milli-, micro-, or nanoseconds) to ensure that the leading digit is non-zero. The zero duration formats as 0s.
type Location ¶
A Location maps time instants to the zone in use at that time. This is simplified implementation that does not support historical changes.
type Time ¶
type Time struct {
// contains filtered or unexported fields
}
A Time represents an instant in time with nanosecond precision.
Programs using times should typically store and pass them as values, not pointers. That is, time variables and struct fields should be of type time.Time, not *time.Time. A Time value can be used by multiple goroutines simultaneously.
Time instants can be compared using the Before, After, and Equal methods. The Sub method subtracts two instants, producing a Duration. The Add method adds a Time and a Duration, producing a Time.
The zero value of type Time is January 1, year 1, 00:00:00.000000000 UTC. As this time is unlikely to come up in practice, the IsZero method gives a simple way of detecting a time that has not been initialized explicitly.
Each Time has associated with it a Location, consulted when computing the presentation form of the time, such as in the Format, Hour, and Year methods. The methods Local, UTC, and In return a Time with a specific location. Changing the location in this way changes only the presentation; it does not change the instant in time being denoted and therefore does not affect the computations described in earlier paragraphs.
Note that the Go == operator compares not just the time instant but also the Location. Therefore, Time values should not be used as map or database keys without first guaranteeing that the identical Location has been set for all values, which can be achieved through use of the UTC or Local method.
func Date ¶
Date returns the Time corresponding to
yyyy-mm-dd hh:mm:ss + nsec nanoseconds
in the appropriate zone for that time in the given location.
The month, day, hour, min, sec, and nsec values may be outside their usual ranges and will be normalized during the conversion. For example, October 32 converts to November 1.
A daylight savings time transition skips or repeats times. For example, in the United States, March 13, 2011 2:15am never occurred, while November 6, 2011 1:15am occurred twice. In such cases, the choice of time zone, and therefore the time, is not well-defined. Date returns a time that is correct in one of the two zones involved in the transition, but it does not guarantee which.
Date panics if loc is nil.
func Unix ¶
Unix returns the local Time corresponding to the given Unix time, sec seconds and nsec nanoseconds since January 1, 1970 UTC. It is valid to pass nsec outside the range [0, 999999999]. Not all sec values have a corresponding time value. One such value is 1<<63-1 (the largest int64 value).
func (Time) AddDate ¶
AddDate returns the time corresponding to adding the given number of years, months, and days to t. For example, AddDate(-1, 2, 3) applied to January 1, 2011 returns March 4, 2010.
AddDate normalizes its result in the same way that Date does, so, for example, adding one month to October 31 yields December 1, the normalized form for November 31.
func (Time) Equal ¶
Equal reports whether t and u represent the same time instant. Two times can be equal even if they are in different locations. For example, 6:00 +0200 CEST and 4:00 UTC are Equal. Do not use == with Time values.
func (Time) ISOWeek ¶
ISOWeek returns the ISO 8601 year and week number in which t occurs. Week ranges from 1 to 53. Jan 01 to Jan 03 of year n might belong to week 52 or 53 of year n-1, and Dec 29 to Dec 31 might belong to week 1 of year n+1.
func (Time) IsZero ¶
IsZero reports whether t represents the zero time instant, January 1, year 1, 00:00:00 UTC.
func (Time) Minute ¶
Minute returns the minute offset within the hour specified by t, in the range [0, 59].
func (Time) Nanosecond ¶
Nanosecond returns the nanosecond offset within the second specified by t, in the range [0, 999999999].
func (Time) Round ¶
Round returns the result of rounding t to the nearest multiple of d (since the zero time). The rounding behavior for halfway values is to round up. If d <= 0, Round returns t unchanged.
Round operates on the time as an absolute duration since the zero time; it does not operate on the presentation form of the time. Thus, Round(Hour) may return a time with a non-zero minute, depending on the time's Location.
func (Time) Second ¶
Second returns the second offset within the minute specified by t, in the range [0, 59].
func (Time) Sub ¶
Sub returns the duration t-u. If the result exceeds the maximum (or minimum) value that can be stored in a Duration, the maximum (or minimum) duration will be returned. To compute t-d for a duration d, use t.Add(-d).
func (Time) Truncate ¶
Truncate returns the result of rounding t down to a multiple of d (since the zero time). If d <= 0, Truncate returns t unchanged.
Truncate operates on the time as an absolute duration since the zero time; it does not operate on the presentation form of the time. Thus, Truncate(Hour) may return a time with a non-zero minute, depending on the time's Location.
func (Time) Unix ¶
Unix returns t as a Unix time, the number of seconds elapsed since January 1, 1970 UTC.
func (Time) UnixNano ¶
UnixNano returns t as a Unix time, the number of nanoseconds elapsed since January 1, 1970 UTC. The result is undefined if the Unix time in nanoseconds cannot be represented by an int64 (a date before the year 1678 or after 2262). Note that this means the result of calling UnixNano on the zero Time is undefined.
Source Files
Directories