Golang time.Time.Sub() function example

package time

Golang time.Time.Sub() function usage example. Useful in calculating time differences or elapsed time.

 package main

 import (
 "fmt"
 "time"
 )

 func main() {

 now := time.Now()

 fmt.Println("Today : ", now.Format("Mon, Jan 2, 2006 at 3:04pm"))

 longTimeAgo := time.Date(2010, time.May, 18, 23, 0, 0, 0, time.UTC)

 // calculate the time different between today
 // and long time ago

 diff := now.Sub(longTimeAgo)

 // convert diff to days
 days := int(diff.Hours() / 24)

 fmt.Printf("18th May 2010 was %d days ago \n", days)

 }

Sample output :

Today : Mon, Aug 10, 2015 at 12:05pm

18th May 2010 was 1909 days ago

References :

https://www.socketloop.com/tutorials/golang-calculate-time-different

http://golang.org/pkg/time/#Time.Sub