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277 lines
9 KiB
Go
277 lines
9 KiB
Go
// Copyright 2016 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package civil implements types for civil time, a time-zone-independent
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// representation of time that follows the rules of the proleptic
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// Gregorian calendar with exactly 24-hour days, 60-minute hours, and 60-second
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// minutes.
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//
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// Because they lack location information, these types do not represent unique
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// moments or intervals of time. Use time.Time for that purpose.
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package civil
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import (
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"fmt"
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"time"
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)
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// A Date represents a date (year, month, day).
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//
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// This type does not include location information, and therefore does not
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// describe a unique 24-hour timespan.
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type Date struct {
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Year int // Year (e.g., 2014).
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Month time.Month // Month of the year (January = 1, ...).
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Day int // Day of the month, starting at 1.
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}
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// DateOf returns the Date in which a time occurs in that time's location.
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func DateOf(t time.Time) Date {
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var d Date
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d.Year, d.Month, d.Day = t.Date()
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return d
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}
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// ParseDate parses a string in RFC3339 full-date format and returns the date value it represents.
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func ParseDate(s string) (Date, error) {
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t, err := time.Parse("2006-01-02", s)
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if err != nil {
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return Date{}, err
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}
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return DateOf(t), nil
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}
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// String returns the date in RFC3339 full-date format.
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func (d Date) String() string {
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return fmt.Sprintf("%04d-%02d-%02d", d.Year, d.Month, d.Day)
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}
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// IsValid reports whether the date is valid.
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func (d Date) IsValid() bool {
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return DateOf(d.In(time.UTC)) == d
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}
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// In returns the time corresponding to time 00:00:00 of the date in the location.
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//
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// In is always consistent with time.Date, even when time.Date returns a time
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// on a different day. For example, if loc is America/Indiana/Vincennes, then both
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// time.Date(1955, time.May, 1, 0, 0, 0, 0, loc)
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// and
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// civil.Date{Year: 1955, Month: time.May, Day: 1}.In(loc)
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// return 23:00:00 on April 30, 1955.
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//
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// In panics if loc is nil.
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func (d Date) In(loc *time.Location) time.Time {
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return time.Date(d.Year, d.Month, d.Day, 0, 0, 0, 0, loc)
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}
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// AddDays returns the date that is n days in the future.
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// n can also be negative to go into the past.
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func (d Date) AddDays(n int) Date {
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return DateOf(d.In(time.UTC).AddDate(0, 0, n))
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}
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// DaysSince returns the signed number of days between the date and s, not including the end day.
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// This is the inverse operation to AddDays.
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func (d Date) DaysSince(s Date) (days int) {
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// We convert to Unix time so we do not have to worry about leap seconds:
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// Unix time increases by exactly 86400 seconds per day.
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deltaUnix := d.In(time.UTC).Unix() - s.In(time.UTC).Unix()
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return int(deltaUnix / 86400)
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}
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// Before reports whether d1 occurs before d2.
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func (d1 Date) Before(d2 Date) bool {
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if d1.Year != d2.Year {
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return d1.Year < d2.Year
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}
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if d1.Month != d2.Month {
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return d1.Month < d2.Month
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}
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return d1.Day < d2.Day
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}
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// After reports whether d1 occurs after d2.
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func (d1 Date) After(d2 Date) bool {
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return d2.Before(d1)
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}
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// MarshalText implements the encoding.TextMarshaler interface.
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// The output is the result of d.String().
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func (d Date) MarshalText() ([]byte, error) {
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return []byte(d.String()), nil
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}
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// UnmarshalText implements the encoding.TextUnmarshaler interface.
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// The date is expected to be a string in a format accepted by ParseDate.
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func (d *Date) UnmarshalText(data []byte) error {
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var err error
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*d, err = ParseDate(string(data))
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return err
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}
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// A Time represents a time with nanosecond precision.
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//
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// This type does not include location information, and therefore does not
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// describe a unique moment in time.
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//
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// This type exists to represent the TIME type in storage-based APIs like BigQuery.
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// Most operations on Times are unlikely to be meaningful. Prefer the DateTime type.
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type Time struct {
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Hour int // The hour of the day in 24-hour format; range [0-23]
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Minute int // The minute of the hour; range [0-59]
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Second int // The second of the minute; range [0-59]
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Nanosecond int // The nanosecond of the second; range [0-999999999]
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}
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// TimeOf returns the Time representing the time of day in which a time occurs
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// in that time's location. It ignores the date.
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func TimeOf(t time.Time) Time {
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var tm Time
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tm.Hour, tm.Minute, tm.Second = t.Clock()
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tm.Nanosecond = t.Nanosecond()
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return tm
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}
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// ParseTime parses a string and returns the time value it represents.
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// ParseTime accepts an extended form of the RFC3339 partial-time format. After
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// the HH:MM:SS part of the string, an optional fractional part may appear,
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// consisting of a decimal point followed by one to nine decimal digits.
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// (RFC3339 admits only one digit after the decimal point).
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func ParseTime(s string) (Time, error) {
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t, err := time.Parse("15:04:05.999999999", s)
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if err != nil {
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return Time{}, err
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}
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return TimeOf(t), nil
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}
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// String returns the date in the format described in ParseTime. If Nanoseconds
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// is zero, no fractional part will be generated. Otherwise, the result will
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// end with a fractional part consisting of a decimal point and nine digits.
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func (t Time) String() string {
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s := fmt.Sprintf("%02d:%02d:%02d", t.Hour, t.Minute, t.Second)
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if t.Nanosecond == 0 {
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return s
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}
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return s + fmt.Sprintf(".%09d", t.Nanosecond)
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}
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// IsValid reports whether the time is valid.
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func (t Time) IsValid() bool {
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// Construct a non-zero time.
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tm := time.Date(2, 2, 2, t.Hour, t.Minute, t.Second, t.Nanosecond, time.UTC)
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return TimeOf(tm) == t
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}
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// MarshalText implements the encoding.TextMarshaler interface.
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// The output is the result of t.String().
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func (t Time) MarshalText() ([]byte, error) {
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return []byte(t.String()), nil
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}
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// UnmarshalText implements the encoding.TextUnmarshaler interface.
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// The time is expected to be a string in a format accepted by ParseTime.
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func (t *Time) UnmarshalText(data []byte) error {
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var err error
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*t, err = ParseTime(string(data))
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return err
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}
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// A DateTime represents a date and time.
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//
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// This type does not include location information, and therefore does not
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// describe a unique moment in time.
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type DateTime struct {
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Date Date
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Time Time
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}
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// Note: We deliberately do not embed Date into DateTime, to avoid promoting AddDays and Sub.
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// DateTimeOf returns the DateTime in which a time occurs in that time's location.
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func DateTimeOf(t time.Time) DateTime {
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return DateTime{
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Date: DateOf(t),
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Time: TimeOf(t),
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}
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}
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// ParseDateTime parses a string and returns the DateTime it represents.
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// ParseDateTime accepts a variant of the RFC3339 date-time format that omits
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// the time offset but includes an optional fractional time, as described in
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// ParseTime. Informally, the accepted format is
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// YYYY-MM-DDTHH:MM:SS[.FFFFFFFFF]
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// where the 'T' may be a lower-case 't'.
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func ParseDateTime(s string) (DateTime, error) {
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t, err := time.Parse("2006-01-02T15:04:05.999999999", s)
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if err != nil {
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t, err = time.Parse("2006-01-02t15:04:05.999999999", s)
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if err != nil {
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return DateTime{}, err
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}
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}
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return DateTimeOf(t), nil
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}
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// String returns the date in the format described in ParseDate.
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func (dt DateTime) String() string {
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return dt.Date.String() + "T" + dt.Time.String()
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}
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// IsValid reports whether the datetime is valid.
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func (dt DateTime) IsValid() bool {
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return dt.Date.IsValid() && dt.Time.IsValid()
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}
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// In returns the time corresponding to the DateTime in the given location.
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//
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// If the time is missing or ambigous at the location, In returns the same
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// result as time.Date. For example, if loc is America/Indiana/Vincennes, then
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// both
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// time.Date(1955, time.May, 1, 0, 30, 0, 0, loc)
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// and
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// civil.DateTime{
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// civil.Date{Year: 1955, Month: time.May, Day: 1}},
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// civil.Time{Minute: 30}}.In(loc)
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// return 23:30:00 on April 30, 1955.
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//
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// In panics if loc is nil.
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func (dt DateTime) In(loc *time.Location) time.Time {
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return time.Date(dt.Date.Year, dt.Date.Month, dt.Date.Day, dt.Time.Hour, dt.Time.Minute, dt.Time.Second, dt.Time.Nanosecond, loc)
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}
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// Before reports whether dt1 occurs before dt2.
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func (dt1 DateTime) Before(dt2 DateTime) bool {
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return dt1.In(time.UTC).Before(dt2.In(time.UTC))
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}
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// After reports whether dt1 occurs after dt2.
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func (dt1 DateTime) After(dt2 DateTime) bool {
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return dt2.Before(dt1)
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}
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// MarshalText implements the encoding.TextMarshaler interface.
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// The output is the result of dt.String().
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func (dt DateTime) MarshalText() ([]byte, error) {
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return []byte(dt.String()), nil
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}
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// UnmarshalText implements the encoding.TextUnmarshaler interface.
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// The datetime is expected to be a string in a format accepted by ParseDateTime
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func (dt *DateTime) UnmarshalText(data []byte) error {
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var err error
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*dt, err = ParseDateTime(string(data))
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return err
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}
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