Go

Other Go solutions.

package gigasecond

// import path for the time package from the standard library
import "time"

const gigasecond = time.Second * 1_000_000_000

// AddGigasecond should have a comment documenting it.
func AddGigasecond(t time.Time) time.Time {
	return t.Add(gigasecond)
}

Elm

Other Elm solutions.

module Gigasecond exposing (add)

import Time exposing (millisToPosix, posixToMillis)


add : Time.Posix -> Time.Posix
add timestamp =
    (posixToMillis timestamp + 10 ^ 12)
        |> millisToPosix