1// Implementation of TOML's local date/time. 2// 3// Copied over from Google's civil to avoid pulling all the Google dependencies. 4// Originals: 5// https://raw.githubusercontent.com/googleapis/google-cloud-go/ed46f5086358513cf8c25f8e3f022cb838a49d66/civil/civil.go 6// Changes: 7// * Renamed files from civil* to localtime*. 8// * Package changed from civil to toml. 9// * 'Local' prefix added to all structs. 10// 11// Copyright 2016 Google LLC 12// 13// Licensed under the Apache License, Version 2.0 (the "License"); 14// you may not use this file except in compliance with the License. 15// You may obtain a copy of the License at 16// 17// http://www.apache.org/licenses/LICENSE-2.0 18// 19// Unless required by applicable law or agreed to in writing, software 20// distributed under the License is distributed on an "AS IS" BASIS, 21// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 22// See the License for the specific language governing permissions and 23// limitations under the License. 24 25// Package civil implements types for civil time, a time-zone-independent 26// representation of time that follows the rules of the proleptic 27// Gregorian calendar with exactly 24-hour days, 60-minute hours, and 60-second 28// minutes. 29// 30// Because they lack location information, these types do not represent unique 31// moments or intervals of time. Use time.Time for that purpose. 32package toml 33 34import ( 35 "fmt" 36 "time" 37) 38 39// A LocalDate represents a date (year, month, day). 40// 41// This type does not include location information, and therefore does not 42// describe a unique 24-hour timespan. 43type LocalDate struct { 44 Year int // Year (e.g., 2014). 45 Month time.Month // Month of the year (January = 1, ...). 46 Day int // Day of the month, starting at 1. 47} 48 49// LocalDateOf returns the LocalDate in which a time occurs in that time's location. 50func LocalDateOf(t time.Time) LocalDate { 51 var d LocalDate 52 d.Year, d.Month, d.Day = t.Date() 53 return d 54} 55 56// ParseLocalDate parses a string in RFC3339 full-date format and returns the date value it represents. 57func ParseLocalDate(s string) (LocalDate, error) { 58 t, err := time.Parse("2006-01-02", s) 59 if err != nil { 60 return LocalDate{}, err 61 } 62 return LocalDateOf(t), nil 63} 64 65// String returns the date in RFC3339 full-date format. 66func (d LocalDate) String() string { 67 return fmt.Sprintf("%04d-%02d-%02d", d.Year, d.Month, d.Day) 68} 69 70// IsValid reports whether the date is valid. 71func (d LocalDate) IsValid() bool { 72 return LocalDateOf(d.In(time.UTC)) == d 73} 74 75// In returns the time corresponding to time 00:00:00 of the date in the location. 76// 77// In is always consistent with time.LocalDate, even when time.LocalDate returns a time 78// on a different day. For example, if loc is America/Indiana/Vincennes, then both 79// time.LocalDate(1955, time.May, 1, 0, 0, 0, 0, loc) 80// and 81// civil.LocalDate{Year: 1955, Month: time.May, Day: 1}.In(loc) 82// return 23:00:00 on April 30, 1955. 83// 84// In panics if loc is nil. 85func (d LocalDate) In(loc *time.Location) time.Time { 86 return time.Date(d.Year, d.Month, d.Day, 0, 0, 0, 0, loc) 87} 88 89// AddDays returns the date that is n days in the future. 90// n can also be negative to go into the past. 91func (d LocalDate) AddDays(n int) LocalDate { 92 return LocalDateOf(d.In(time.UTC).AddDate(0, 0, n)) 93} 94 95// DaysSince returns the signed number of days between the date and s, not including the end day. 96// This is the inverse operation to AddDays. 97func (d LocalDate) DaysSince(s LocalDate) (days int) { 98 // We convert to Unix time so we do not have to worry about leap seconds: 99 // Unix time increases by exactly 86400 seconds per day. 100 deltaUnix := d.In(time.UTC).Unix() - s.In(time.UTC).Unix() 101 return int(deltaUnix / 86400) 102} 103 104// Before reports whether d1 occurs before d2. 105func (d1 LocalDate) Before(d2 LocalDate) bool { 106 if d1.Year != d2.Year { 107 return d1.Year < d2.Year 108 } 109 if d1.Month != d2.Month { 110 return d1.Month < d2.Month 111 } 112 return d1.Day < d2.Day 113} 114 115// After reports whether d1 occurs after d2. 116func (d1 LocalDate) After(d2 LocalDate) bool { 117 return d2.Before(d1) 118} 119 120// MarshalText implements the encoding.TextMarshaler interface. 121// The output is the result of d.String(). 122func (d LocalDate) MarshalText() ([]byte, error) { 123 return []byte(d.String()), nil 124} 125 126// UnmarshalText implements the encoding.TextUnmarshaler interface. 127// The date is expected to be a string in a format accepted by ParseLocalDate. 128func (d *LocalDate) UnmarshalText(data []byte) error { 129 var err error 130 *d, err = ParseLocalDate(string(data)) 131 return err 132} 133 134// A LocalTime represents a time with nanosecond precision. 135// 136// This type does not include location information, and therefore does not 137// describe a unique moment in time. 138// 139// This type exists to represent the TIME type in storage-based APIs like BigQuery. 140// Most operations on Times are unlikely to be meaningful. Prefer the LocalDateTime type. 141type LocalTime struct { 142 Hour int // The hour of the day in 24-hour format; range [0-23] 143 Minute int // The minute of the hour; range [0-59] 144 Second int // The second of the minute; range [0-59] 145 Nanosecond int // The nanosecond of the second; range [0-999999999] 146} 147 148// LocalTimeOf returns the LocalTime representing the time of day in which a time occurs 149// in that time's location. It ignores the date. 150func LocalTimeOf(t time.Time) LocalTime { 151 var tm LocalTime 152 tm.Hour, tm.Minute, tm.Second = t.Clock() 153 tm.Nanosecond = t.Nanosecond() 154 return tm 155} 156 157// ParseLocalTime parses a string and returns the time value it represents. 158// ParseLocalTime accepts an extended form of the RFC3339 partial-time format. After 159// the HH:MM:SS part of the string, an optional fractional part may appear, 160// consisting of a decimal point followed by one to nine decimal digits. 161// (RFC3339 admits only one digit after the decimal point). 162func ParseLocalTime(s string) (LocalTime, error) { 163 t, err := time.Parse("15:04:05.999999999", s) 164 if err != nil { 165 return LocalTime{}, err 166 } 167 return LocalTimeOf(t), nil 168} 169 170// String returns the date in the format described in ParseLocalTime. If Nanoseconds 171// is zero, no fractional part will be generated. Otherwise, the result will 172// end with a fractional part consisting of a decimal point and nine digits. 173func (t LocalTime) String() string { 174 s := fmt.Sprintf("%02d:%02d:%02d", t.Hour, t.Minute, t.Second) 175 if t.Nanosecond == 0 { 176 return s 177 } 178 return s + fmt.Sprintf(".%09d", t.Nanosecond) 179} 180 181// IsValid reports whether the time is valid. 182func (t LocalTime) IsValid() bool { 183 // Construct a non-zero time. 184 tm := time.Date(2, 2, 2, t.Hour, t.Minute, t.Second, t.Nanosecond, time.UTC) 185 return LocalTimeOf(tm) == t 186} 187 188// MarshalText implements the encoding.TextMarshaler interface. 189// The output is the result of t.String(). 190func (t LocalTime) MarshalText() ([]byte, error) { 191 return []byte(t.String()), nil 192} 193 194// UnmarshalText implements the encoding.TextUnmarshaler interface. 195// The time is expected to be a string in a format accepted by ParseLocalTime. 196func (t *LocalTime) UnmarshalText(data []byte) error { 197 var err error 198 *t, err = ParseLocalTime(string(data)) 199 return err 200} 201 202// A LocalDateTime represents a date and time. 203// 204// This type does not include location information, and therefore does not 205// describe a unique moment in time. 206type LocalDateTime struct { 207 Date LocalDate 208 Time LocalTime 209} 210 211// Note: We deliberately do not embed LocalDate into LocalDateTime, to avoid promoting AddDays and Sub. 212 213// LocalDateTimeOf returns the LocalDateTime in which a time occurs in that time's location. 214func LocalDateTimeOf(t time.Time) LocalDateTime { 215 return LocalDateTime{ 216 Date: LocalDateOf(t), 217 Time: LocalTimeOf(t), 218 } 219} 220 221// ParseLocalDateTime parses a string and returns the LocalDateTime it represents. 222// ParseLocalDateTime accepts a variant of the RFC3339 date-time format that omits 223// the time offset but includes an optional fractional time, as described in 224// ParseLocalTime. Informally, the accepted format is 225// YYYY-MM-DDTHH:MM:SS[.FFFFFFFFF] 226// where the 'T' may be a lower-case 't'. 227func ParseLocalDateTime(s string) (LocalDateTime, error) { 228 t, err := time.Parse("2006-01-02T15:04:05.999999999", s) 229 if err != nil { 230 t, err = time.Parse("2006-01-02t15:04:05.999999999", s) 231 if err != nil { 232 return LocalDateTime{}, err 233 } 234 } 235 return LocalDateTimeOf(t), nil 236} 237 238// String returns the date in the format described in ParseLocalDate. 239func (dt LocalDateTime) String() string { 240 return dt.Date.String() + "T" + dt.Time.String() 241} 242 243// IsValid reports whether the datetime is valid. 244func (dt LocalDateTime) IsValid() bool { 245 return dt.Date.IsValid() && dt.Time.IsValid() 246} 247 248// In returns the time corresponding to the LocalDateTime in the given location. 249// 250// If the time is missing or ambigous at the location, In returns the same 251// result as time.LocalDate. For example, if loc is America/Indiana/Vincennes, then 252// both 253// time.LocalDate(1955, time.May, 1, 0, 30, 0, 0, loc) 254// and 255// civil.LocalDateTime{ 256// civil.LocalDate{Year: 1955, Month: time.May, Day: 1}}, 257// civil.LocalTime{Minute: 30}}.In(loc) 258// return 23:30:00 on April 30, 1955. 259// 260// In panics if loc is nil. 261func (dt LocalDateTime) In(loc *time.Location) time.Time { 262 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) 263} 264 265// Before reports whether dt1 occurs before dt2. 266func (dt1 LocalDateTime) Before(dt2 LocalDateTime) bool { 267 return dt1.In(time.UTC).Before(dt2.In(time.UTC)) 268} 269 270// After reports whether dt1 occurs after dt2. 271func (dt1 LocalDateTime) After(dt2 LocalDateTime) bool { 272 return dt2.Before(dt1) 273} 274 275// MarshalText implements the encoding.TextMarshaler interface. 276// The output is the result of dt.String(). 277func (dt LocalDateTime) MarshalText() ([]byte, error) { 278 return []byte(dt.String()), nil 279} 280 281// UnmarshalText implements the encoding.TextUnmarshaler interface. 282// The datetime is expected to be a string in a format accepted by ParseLocalDateTime 283func (dt *LocalDateTime) UnmarshalText(data []byte) error { 284 var err error 285 *dt, err = ParseLocalDateTime(string(data)) 286 return err 287} 288