timeutil - useful extensions to the golang's time package

timeutil provides useful extensions (Timedelta, Strftime, ...) to the golang's time package.

Quick Start

go get github.com/leekchan/timeutil

example.go

package main

import (
    "fmt"
    "time"

    "github.com/leekchan/timeutil"
)

func main() {
    // Timedelta
    // A basic usage.
    base := time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)
    td := timeutil.Timedelta{Days: 10, Minutes: 17, Seconds: 56}

    result := base.Add(td.Duration())
    fmt.Println(result) // "2015-02-13 00:17:56 +0000 UTC"

    // Operation : Add
    base = time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)

    td = timeutil.Timedelta{Days: 1, Minutes: 1, Seconds: 1}
    td2 := timeutil.Timedelta{Days: 2, Minutes: 2, Seconds: 2}
    td = td.Add(&td2) // td = td + td2

    result = base.Add(td.Duration())
    fmt.Println(result) // "2015-02-06 00:03:03 +0000 UTC"

    // Operation : Subtract
    base = time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)

    td = timeutil.Timedelta{Days: 2, Minutes: 2, Seconds: 2}
    td2 = timeutil.Timedelta{Days: 1, Minutes: 1, Seconds: 1}
    td = td.Subtract(&td2) // td = td - td2

    result = base.Add(td.Duration())
    fmt.Println(result) // "2015-02-04 00:01:01 +0000 UTC"

    // Operation : Abs
    base = time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)

    td = timeutil.Timedelta{Days: 1, Minutes: 1, Seconds: 1}
    td2 = timeutil.Timedelta{Days: 2, Minutes: 2, Seconds: 2}
    td = td.Subtract(&td2) // td = td - td2
    td = td.Abs()          // td = |td|

    result = base.Add(td.Duration())
    fmt.Println(result) // "2015-02-04 00:01:01 +0000 UTC"
    
    
    // Strftime
    date := time.Date(2015, 7, 2, 15, 24, 30, 35, time.UTC)
    str := timeutil.Strftime(&date, "%a %b %d %I:%M:%S %p %Y")
    fmt.Println(str) // "Thu Jul 02 03:24:30 PM 2015"
    
    // Unicode support
    str = timeutil.Strftime(&date, "작성일 : %a %b %d %I:%M:%S %p %Y")
    fmt.Println(str) // "작성일 : Thu Jul 02 03:24:30 PM 2015"
}

Timedelta

Timedelta represents a duration between two dates. (inspired by python's timedelta)

Timedelta struct

type Timedelta struct {
    Days, Seconds, Microseconds, Milliseconds, Minutes, Hours, Weeks time.Duration
}

Initialization

All fields are optional and default to 0. You can initialize any type of timedelta by specifying field values which you want to use.

Examples:

td := timeutil.Timedelta{Days: 10}
td = timeutil.Timedelta{Minutes: 17}
td = timeutil.Timedelta{Seconds: 56}
td = timeutil.Timedelta{Days: 10, Minutes: 17, Seconds: 56}
td = timeutil.Timedelta{Days: 1, Seconds: 1, Microseconds: 1, Milliseconds: 1, Minutes: 1, Hours: 1, Weeks: 1}

func (t *Timedelta) Duration() time.Duration

Duration() returns time.Duration. time.Duration can be added to time.Date.

Examples:

base := time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)
td := timeutil.Timedelta{Days: 10, Minutes: 17, Seconds: 56}

result := base.Add(td.Duration())
fmt.Println(result) // "2015-02-13 00:17:56 +0000 UTC"

Operations

func (t *Timedelta) Add(t2 *Timedelta)

Add returns the Timedelta t+t2.

Examples:

base := time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)
td := timeutil.Timedelta{Days: 1, Minutes: 1, Seconds: 1}
td2 := timeutil.Timedelta{Days: 2, Minutes: 2, Seconds: 2}
td = td.Add(&td2) // td = td + td2

result = base.Add(td.Duration())
fmt.Println(result) // "2015-02-06 00:03:03 +0000 UTC"

func (t *Timedelta) Subtract(t2 *Timedelta) Timedelta

Subtract returns the Timedelta t-t2.

Examples:

base := time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)

td := timeutil.Timedelta{Days: 2, Minutes: 2, Seconds: 2}
td2 := timeutil.Timedelta{Days: 1, Minutes: 1, Seconds: 1}
td = td.Subtract(&td2) // td = td - td2

result = base.Add(td.Duration())
fmt.Println(result) // "2015-02-04 00:01:01 +0000 UTC"

func (t *Timedelta) Abs() Timedelta

Abs returns the absolute value of t

Examples:

base := time.Date(2015, 2, 3, 0, 0, 0, 0, time.UTC)

td := timeutil.Timedelta{Days: 1, Minutes: 1, Seconds: 1}
td2 := timeutil.Timedelta{Days: 2, Minutes: 2, Seconds: 2}
td = td.Subtract(&td2) // td = td - td2
td = td.Abs() // td = |td|

result = base.Add(td.Duration())
fmt.Println(result) // "2015-02-04 00:01:01 +0000 UTC"

Strftime

Strftime formats time.Date according to the directives in the given format string. The directives begins with a percent (%) character.

(Strftime supports unicode format string.)

Directive	Meaning	Example
%a	Weekday as locale’s abbreviated name.	Sun, Mon, ..., Sat
%A	Weekday as locale’s full name.	Sunday, Monday, ..., Saturday
%w	Weekday as a decimal number, where 0 is Sunday and 6 is Saturday	0, 1, ..., 6
%d	Day of the month as a zero-padded decimal number.	01, 02, ..., 31
%b	Month as locale’s abbreviated name.	Jan, Feb, ..., Dec
%B	Month as locale’s full name.	January, February, ..., December
%m	Month as a zero-padded decimal number.	01, 02, ..., 12
%y	Year without century as a zero-padded decimal number.	00, 01, ..., 99
%Y	Year with century as a decimal number.	1970, 1988, 2001, 2013
%H	Hour (24-hour clock) as a zero-padded decimal number.	00, 01, ..., 23
%I	Hour (12-hour clock) as a zero-padded decimal number.	01, 02, ..., 12
%p	Meridian indicator. (AM or PM.)	AM, PM
%M	Minute as a zero-padded decimal number.	00, 01, ..., 59
%S	Second as a zero-padded decimal number.	00, 01, ..., 59
%f	Microsecond as a decimal number, zero-padded on the left.	000000, 000001, ..., 999999
%z	UTC offset in the form +HHMM or -HHMM	+0000
%Z	Time zone name	UTC
%j	Day of the year as a zero-padded decimal number	001, 002, ..., 366
%U	Week number of the year (Sunday as the first day of the week) as a zero padded decimal number. All days in a new year preceding the first Sunday are considered to be in week 0.	00, 01, ..., 53
%W	Week number of the year (Monday as the first day of the week) as a decimal number. All days in a new year preceding the first Monday are considered to be in week 0.	00, 01, ..., 53
%c	Date and time representation.	Tue Aug 16 21:30:00 1988
%x	Date representation.	08/16/88
%X	Time representation.	21:30:00
%%	A literal '%' character.	%

Examples:

date := time.Date(2015, 7, 2, 15, 24, 30, 35, time.UTC)
str := timeutil.Strftime(&date, "%a %b %d %I:%M:%S %p %Y")
fmt.Println(str) // "Thu Jul 02 03:24:30 PM 2015"

// Unicode support
str = timeutil.Strftime(&date, "작성일 : %a %b %d %I:%M:%S %p %Y")
fmt.Println(str) // "작성일 : Thu Jul 02 03:24:30 PM 2015"

TODO

• Locale support
• Strptime - a function which returns a time.Date parsed according to a format string
• Auto date parser - a generic string parser which is able to parse most known formats to represent a date
• And other useful features...