Golang : Get time.Duration in year, month, week or day

Problem:

When using time.Until() or time.Since() functions, the time.Duration type have methods such as Hour(), Minutes(), Nanoseconds() and Seconds() to return the duration in respective denomination. How to convert the duration into year, month, week or day?

Solution:

Use Seconds() to retrieve the duration in seconds and then divide it with 86400 for days, 604800 for weeks and so on...

NOTE: This example is for converting time duration, not for calculating time differences. Duration != Difference

For calculating time differences, see https://socketloop.com/tutorials/golang-human-readable-time-elapsed-format-such-as-5-days-ago

Here you go!

 package main

 import (
 "fmt"
 "math"
 "time"
 )

 func RoundTime(input float64) int {
 var result float64

 if input < 0 {
 result = math.Ceil(input - 0.5)
 } else {
 result = math.Floor(input + 0.5)
 }

 // only interested in integer, ignore fractional
 i, _ := math.Modf(result)

 return int(i)
 }

 func main() {

 layOut := "02/01/2006 15:04:05" // dd/mm/yyyy hh:mm:ss
 future, err := time.Parse(layOut, "07/05/2018 15:12:10")

 if err != nil {
 panic(err)
 }

 diff := time.Until(future)

 fmt.Println("Now : ", time.Now())
 fmt.Println("Time reach the future date : ", future)

 fmt.Println("Raw : ", diff)
 fmt.Println("Hours : ", diff.Hours())
 fmt.Println("Minutes : ", diff.Minutes())
 fmt.Println("Seconds : ", diff.Seconds())
 fmt.Println("Nano seconds : ", diff.Nanoseconds)

 // get day, month and year

 fmt.Println("Days : ", RoundTime(diff.Seconds()/86400))
 fmt.Println("Weeks : ", RoundTime(diff.Seconds()/604800))
 fmt.Println("Months : ", RoundTime(diff.Seconds()/2600640))
 fmt.Println("Years : ", RoundTime(diff.Seconds()/31207680))
 }

Sample output:

Now : 2017-05-06 21:13:09.450925287 +0800 MYT

Time reach the future date : 2018-05-07 15:12:10 +0000 UTC

Raw : 8785h59m0.54907493s

Hours : 8785.983485854147

Minutes : 527159.0091512488

Seconds : 3.162954054907493e+07

Nano seconds : 0x108d7b0

Days : 366

Weeks : 52

Months : 12

Years : 1