How to Format Current Time Using a yyyyMMddHHmmss Format?

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?

Accepted Answer

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:

Answer 3

Must Read

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

How to Format Current Time Using a yyyyMMddHHmmss Format?

6 Answers

Must Read

Option 1: Go standard library

Sarah Jenkins