Go by Example: Epoch

A common requirement in programs is getting the number of seconds, milliseconds, or nanoseconds since the Unix epoch. Here’s how to do it in Go.

 
package main
 
import (
    "fmt"
    "time"
)
 
func main() {

Use time.Now with Unix, UnixMilli or UnixNano to get elapsed time since the Unix epoch in seconds, milliseconds or nanoseconds, respectively.

 
    now := time.Now()
    fmt.Println(now)
 
    fmt.Println(now.Unix())
    fmt.Println(now.UnixMilli())
    fmt.Println(now.UnixNano())

You can also convert integer seconds or nanoseconds since the epoch into the corresponding time.

 
    fmt.Println(time.Unix(now.Unix(), 0))
    fmt.Println(time.Unix(0, now.UnixNano()))
}
 
$ go run epoch.go 
2012-10-31 16:13:58.292387 +0000 UTC
1351700038
1351700038292
1351700038292387000
2012-10-31 16:13:58 +0000 UTC
2012-10-31 16:13:58.292387 +0000 UTC

Next we’ll look at another time-related task: time parsing and formatting.

Next example: Time Formatting / Parsing.

by Mark McGranaghan and Eli Bendersky | source | license