How to format current time using a yyyyMMddHHmmss format? - time

Question

I'm trying to format the current time using this format yyyyMMddHHmmss.
t := time.Now()
fmt.Println(t.Format("yyyyMMddHHmmss"))
That is outputting:
yyyyMMddHHmmss
Any suggestions?

Answer 1

Use
fmt.Println(t.Format("20060102150405"))
as Go uses following constants to format date,refer here
const (
stdLongMonth = "January"
stdMonth = "Jan"
stdNumMonth = "1"
stdZeroMonth = "01"
stdLongWeekDay = "Monday"
stdWeekDay = "Mon"
stdDay = "2"
stdUnderDay = "_2"
stdZeroDay = "02"
stdHour = "15"
stdHour12 = "3"
stdZeroHour12 = "03"
stdMinute = "4"
stdZeroMinute = "04"
stdSecond = "5"
stdZeroSecond = "05"
stdLongYear = "2006"
stdYear = "06"
stdPM = "PM"
stdpm = "pm"
stdTZ = "MST"
stdISO8601TZ = "Z0700" // prints Z for UTC
stdISO8601ColonTZ = "Z07:00" // prints Z for UTC
stdNumTZ = "-0700" // always numeric
stdNumShortTZ = "-07" // always numeric
stdNumColonTZ = "-07:00" // always numeric
stdFracSecond0 = ".0", ".00" // trailing zeros included
stdFracSecond9 = ".9", ".99" // trailing zeros omitted
)

Answer 2

This question comes in top of Google search when you find "golang current time format" so, for all the people that want to use another format, remember that you can always call to:
t := time.Now()
t.Year()
t.Month()
t.Day()
t.Hour()
t.Minute()
t.Second()
For example, to get current date time as "YYYY-MM-DDTHH:MM:SS" (for example 2019-01-22T12:40:55) you can use these methods with fmt.Sprintf:
t := time.Now()
formatted := fmt.Sprintf("%d-%02d-%02dT%02d:%02d:%02d",
t.Year(), t.Month(), t.Day(),
t.Hour(), t.Minute(), t.Second())
As always, remember that docs are the best source of learning: https://golang.org/pkg/time/

Answer 3

Option 1: Go standard library
t.Format("20060102150405")
Unit
Golang Layout
Examples
Note
Year
06
21, 81, 01
Year
2006
2021, 1981, 0001
Month
January
January, February, December
Month
Jan
Jan, Feb, Dec
Month
1
1, 2, 12
Month
01
01, 02, 12
Day
Monday
Monday, Wednesday, Sunday
Day
Mon
Mon, Wed, Sun
Day
2
1, 2, 11, 31
Day
02
01, 02, 11, 31
zero padded day of the month
Day
_2
⎵1, ⎵2, 11, 31
space padded day of the month
Day
002
001, 002, 011, 031, 145, 365, 366
zero padded day of the year
Day
__2
⎵⎵1, ⎵⎵2, ⎵11, ⎵31, 365, 366
space padded day of the year
Part of day
PM
AM, PM
Part of day
pm
am, pm
Hour 24h
15
00, 01, 12, 23
Hour 12h
3
1, 2, 12
Hour 12h
03
01, 02, 12
Minute
4
0, 4 ,10, 35
Minute
04
00, 04 ,10, 35
Second
5
0, 5, 25
Second
05
00, 05, 25
10-1 to 10-9 s
.0 .000000000
.1, .199000000
Trailing zeros included
10-1 to 10-9 s
.9 .999999999
.1, .199
Trailing zeros omitted
Time zone
MST
UTC, MST, CET
Time zone
Z07
Z, +08, -05
Z is for UTC
Time zone
Z0700
Z, +0800, -0500
Z is for UTC
Time zone
Z070000
Z, +080000, -050000
Z is for UTC
Time zone
Z07:00
Z, +08:00, -05:00
Z is for UTC
Time zone
Z07:00:00
Z, +08:00:00, -05:00:00
Z is for UTC
Time zone
-07
+00, +08, -05
Time zone
-0700
+0000, +0800, -0500
Time zone
-070000
+000000, +080000, -050000
Time zone
-07:00
+00:00, +08:00, -05:00
Time zone
-07:00:00
+00:00:00, +08:00:00, -05:00:00
In Golang 1.17+ for fraction of seconds (.999 or .000) you can use , instead of . (,999 or ,000) but output is always with .!!! See https://github.com/golang/go/issues/48037
Option 2: strftime Go implementation
import strftime "github.com/itchyny/timefmt-go"
strftime.Format(t, "%Y%m%d%H%M%S")
See for more info
https://github.com/itchyny/timefmt-go
https://linux.die.net/man/3/strftime

Answer 4

import("time")
layout := "2006-01-02T15:04:05.000Z"
str := "2014-11-12T11:45:26.371Z"
t, err := time.Parse(layout, str)
if err != nil {
fmt.Println(err)
}
fmt.Println(t)
gives:
>> 2014-11-12 11:45:26.371 +0000 UTC

Answer 5

Time package in Golang has some methods that might be worth looking.
func (Time) Format
func (t Time) Format(layout string) string
Format returns a textual representation of the time value formatted according to layout, which defines the format by showing how the reference time,
Mon Jan 2 15:04:05 -0700 MST 2006
would be displayed if it were the value; it serves as an example of the desired output. The same display rules will then be applied to the time value. Predefined layouts ANSIC, UnixDate, RFC3339 and others describe standard and convenient representations of the reference time. For more information about the formats and the definition of the reference time, see the documentation for ANSIC and the other constants defined by this package.
Source (http://golang.org/pkg/time/#Time.Format)
I also found an example of defining the layout (http://golang.org/src/pkg/time/example_test.go)
func ExampleTime_Format() {
// layout shows by example how the reference time should be represented.
const layout = "Jan 2, 2006 at 3:04pm (MST)"
t := time.Date(2009, time.November, 10, 15, 0, 0, 0, time.Local)
fmt.Println(t.Format(layout))
fmt.Println(t.UTC().Format(layout))
// Output:
// Nov 10, 2009 at 3:00pm (PST)
// Nov 10, 2009 at 11:00pm (UTC)
}

Answer 6

Go standard library: time
now := time.Now()
fmt.Println(now) // 2009-11-10 23:00:00 +0000 UTC m=+0.000000001
fmt.Println(now.Format("20060102150405"))
fmt.Println(now.Format("2006/01/02/15/04/05"))
fmt.Println(now.Format("2006-01-02 15:04:05"))
fmt.Println(now.Format("2006-01-02 15:04"))
fmt.Println(now.Format("2006/01/02 15:04:05"))
fmt.Println(now.Format("2006/01/02 15:04:05 (-0700)"))
fmt.Println(now.Format("2006年01月02日 15:04"))
fmt.Println(now.Format(time.Layout)) // 01/02 03:04:05PM '06 -0700
fmt.Println(now.Format(time.ANSIC)) // Mon Jan _2 15:04:05 2006
fmt.Println(now.Format(time.UnixDate)) // Mon Jan _2 15:04:05 MST 2006
fmt.Println(now.Format(time.RubyDate)) // Mon Jan 02 15:04:05 -0700 2006
fmt.Println(now.Format(time.RFC822)) // 02 Jan 06 15:04 MST
fmt.Println(now.Format(time.RFC850)) // Monday, 02-Jan-06 15:04:05 MST
fmt.Println(now.Format(time.Kitchen)) // 3:04PM
fmt.Println(now.Format(time.Stamp)) // Jan _2 15:04:05
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