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dateformat.go
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dateformat.go
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// DateFormat provides convenient date formatting with localization support. Built in support for French, German, Spanish, Dutch, Turkish and English
package dateformat
import (
"fmt"
"regexp"
"time"
)
var tokenRegexp = regexp.MustCompile(`(\[[^\[]*\])|(d{3,4}|Do|D{1,2}|Mo|M{1,4}|YYYY|YY|H{1,2}|h{1,2}|m{1,2}|s{1,2}|A|a|Z{1,2})`)
var magicRegexp = regexp.MustCompile(`(January|Jan|03|3|15|1|01|Monday|Mon|2006|06|02|2|04|4|05|5|PM|pm|\-0700|\-07:00)`)
// DateLocale specifies how to format dates in different languages.
// FormatLocale function accepts a DateLocale instance and formats the date according to given locale.
type DateLocale interface {
// Return the long month name of given index (1 = January, 12 = December)
MonthName(index int) string
// Return the long weekday name of given index (0 = Sunday, 6 = Saturday)
DayName(index int) string
// Return the short month name of given index (1 = Jan, 12 = Dec)
ShortMonthName(index int) string
// Return the short weekday name of given index (0 = Sun, 6 = Sat)
ShortDayName(index int) string
// Return the ordinal value (1 = 1st, 2 = 2nd)
Ordinal(num int) string
}
// Formats given date in "English" locale. See FormatLocale for details.
func Format(t time.Time, format string) string {
return FormatLocale(t, format, English)
}
// Formats a given date according to the format string and date locale.
// Format strings are specified like MMMM Do YYYY, h:mm:ss a, which would yield October 24th 2012, 12:42:03 am in English locale.
// Supported format string tokens:
//
// Month
// M: 1 2 ... 12
// MM: 01 01 ... 12
// Mo: 1st 2nd ... 12th
// MMM: Jan Feb ... Dec
// MMMM: January February ... December
//
// Day of Month
// D: 1 2 ... 31
// DD: 01 02 ... 31
// Do: 1st 2nd ... 31st
//
// Day of Week
// ddd: Sun Mon ... Sat
// dddd: Sunday Monday ... Saturday
//
// Year
// YY: 70 71 ... 12
// YYYY: 1970 1971 ... 2012
//
// Hour
// H: 0 1 2 ... 23
// HH: 00 01 02 .. 23
// h: 1 2 ... 12
// hh: 01 02 ... 12
//
// Minute
// m: 0 1 2 ... 59
// mm: 00 01 02 ... 59
//
// Second
// s: 0 1 2 ... 59
// ss: 00 01 02 ... 59
//
// AM / PM
// A: AM PM
// a: am pm
//
// Timezone
// Z: -07:00 -06:00 ... +07:00
// ZZ: -0700 -0600 ... +0700
//
// Escaping
// It is possible to place arbitrary text within [] to display it as it is.
//
// Sample:
// MMMM Do YYYY, h:mm:ss a [Foo] -> October 24th 2012, 1:52:27 am Foo
func FormatLocale(t time.Time, format string, locale DateLocale) string {
formatted := tokenRegexp.ReplaceAllStringFunc(format, func(token string) string {
switch token {
case "M":
return t.Format("1")
case "MM":
return t.Format("01")
case "Mo":
return locale.Ordinal(int(t.Month()))
case "MMM":
return locale.ShortMonthName(int(t.Month()) - 1)
case "MMMM":
return locale.MonthName(int(t.Month()) - 1)
case "D":
return t.Format("2")
case "DD":
return t.Format("02")
case "Do":
return locale.Ordinal(t.Day())
case "ddd":
return locale.ShortDayName(int(t.Weekday()))
case "dddd":
return locale.DayName(int(t.Weekday()))
case "YY":
return t.Format("06")
case "YYYY":
return t.Format("2006")
case "H":
return fmt.Sprintf("%d", t.Hour())
case "HH":
return fmt.Sprintf("%02d", t.Hour())
case "h":
return t.Format("3")
case "hh":
return t.Format("03")
case "m":
return t.Format("4")
case "mm":
return t.Format("04")
case "s":
return t.Format("5")
case "ss":
return t.Format("05")
case "A":
return t.Format("PM")
case "a":
return t.Format("pm")
case "Z":
return t.Format("-07:00")
case "ZZ":
return t.Format("-0700")
}
if token[0] == '[' && token[len(token)-1] == ']' {
return token[1 : len(token)-1]
}
return token
})
return formatted
}
// Uses built in time package semantics for format string, that is a magic date.
// Instead of "MM", "H" style tokens that Format function accepts, you can supply a sample date as "magic" parameter
// And it will be figured out as the format.
// Given magic date layout must be
// Mon Jan 2 15:04:05 MST 2006
// That is
// 01/02 03:04:05PM '06 -0700
// in a more memorable layout.
//
// Sample:
// magic = Mon, 02 Jan 2006 15:04:05 -0700
// result = Wed, 24 Oct 2012 2:10:11 +0300
func FormatMagic(t time.Time, magic string, locale DateLocale) string {
format := magicRegexp.ReplaceAllStringFunc(magic, func(token string) string {
switch token {
case "1":
return "M"
case "01":
return "MM"
case "Jan":
return "MMM"
case "January":
return "MMMM"
case "2":
return "D"
case "02":
return "DD"
case "Mon":
return "ddd"
case "Monday":
return "dddd"
case "06":
return "YY"
case "2006":
return "YYYY"
case "15":
return "HH"
case "3":
return "h"
case "03":
return "hh"
case "4":
return "m"
case "04":
return "mm"
case "5":
return "s"
case "05":
return "ss"
case "PM":
return "A"
case "pm":
return "a"
case "-07:00":
return "Z"
case "-0700":
return "ZZ"
}
return "[" + token + "]"
})
return FormatLocale(t, format, locale)
}