How to format current time using a yyyyMMddHHmmss format?

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?

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
)

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/

Option 1: Go standard library

t.Format("20060102150405")

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

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

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)
    }

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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