Golang : Calculate time different

Problem :

You are looking to calculate the days between two dates. How to do that in Golang?

Solution :

Use the Time.Sub() function to calculate the differences between the two dates in hour and then convert the hour differences to day.

For example :

 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, May 18, 2015 at 10:50am

18th May 2010 was 1825 days ago

Reference :

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