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Time Formatting in Golang

  • Difficulty Level : Medium
  • Last Updated : 17 May, 2020

Golang supports time formatting and parsing via pattern-based layouts. To format time, we use the Format() method which formats a time.Time object.

Syntax:

func (t Time) Format(layout string) string

We can either provide custom format or predefined date and timestamp format constants are also available which are shown as follows.

FormatExample
ANSIC“Mon Jan _2 15:04:05 2006”
UnixDate“Mon Jan _2 15:04:05 MST 2006”
RubyDate“Mon Jan 02 15:04:05 -0700 2006”
RFC822“02 Jan 06 15:04 MST”
RFC822Z“02 Jan 06 15:04 -0700”
RFC850“Monday, 02-Jan-06 15:04:05 MST”
RFC1123“Mon, 02 Jan 2006 15:04:05 MST”
RFC1123Z“Mon, 02 Jan 2006 15:04:05 -0700”
RFC3339“2006-01-02T15:04:05Z07:00”
RFC3339Nano“2006-01-02T15:04:05.999999999Z07:00”

Layouts must use the reference time Mon Jan 2 15:04:05 MST 2006 to show the pattern with which to format/parse a given time/string.

Example 1:






// Golang program to illustrate the time
// formatting using custom layouts
  
package main
  
import (
    "fmt"
    "time"
)
  
func main() {
  
    // this function returns the present time
    current_time := time.Now()
  
    // individual elements of time can
    // also be called to print accordingly
    fmt.Printf("%d-%02d-%02dT%02d:%02d:%02d-00:00\n",
    current_time.Year(), current_time.Month(), current_time.Day(),
    current_time.Hour(), current_time.Minute(), current_time.Second())
  
    // formatting time using
    // custom formats
    fmt.Println(current_time.Format("2006-01-02 15:04:05"))
    fmt.Println(current_time.Format("2006-January-02"))
    fmt.Println(current_time.Format("2006-01-02 3:4:5 pm"))
}

Output:

2009-11-10T23:00:00-00:00
2009-11-10 23:00:00
2009-November-10
2009-11-10 11:0:0 pm

Example 2:




// Golang program to illustrate the time
// formatting using format constants
package main
  
import (
    "fmt"
    "time"
)
  
func main() {
  
    // this function returns the present time
    current_time := time.Now()
  
    // using inbuilt format constants
    // shown in the table above
    fmt.Println("ANSIC: ", current_time.Format(time.ANSIC))
    fmt.Println("UnixDate: ", current_time.Format(time.UnixDate))
    fmt.Println("RFC1123: ", current_time.Format(time.RFC1123))
    fmt.Println("RFC3339Nano: ", current_time.Format(time.RFC3339Nano))
    fmt.Println("RubyDate: ", current_time.Format(time.RubyDate))
}

Output:

ANSIC:  Tue Nov 10 23:00:00 2009
UnixDate:  Tue Nov 10 23:00:00 UTC 2009
RFC1123:  Tue, 10 Nov 2009 23:00:00 UTC
RFC3339Nano:  2009-11-10T23:00:00Z
RubyDate:  Tue Nov 10 23:00:00 +0000 2009



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