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Go duration conversion can be done in a variety of ways. The time library and the time.duration method are often used to calculate and display time.

Note that duration refers to the time elapsed between two defined time objects, as an int64 count of nanoseconds.

Duration Instance Conversion

Using the time.duration Method

package main

import (
    "fmt"
    "time"
)

func main() {
    d, err := time.ParseDuration("1h25m10.9183256645s")
    if err != nil {
        panic(err)
    }

    count := []time.Duration{
        time.Nanosecond,
        time.Microsecond,
        time.Millisecond,
        time.Second,
        2 * time.Second,
        time.Minute,
        10 * time.Minute,
        time.Hour,
    }

    for _, r := range count {
        fmt.Printf("(%6s) = %s\n", r, d.Round(r).String())
    }
}

Output:

(   1ns) = 1h25m10.918325664s
(   1µs) = 1h25m10.918326s
(   1ms) = 1h25m10.918s
(    1s) = 1h25m11s
(    2s) = 1h25m10s
(  1m0s) = 1h25m0s
( 10m0s) = 1h30m0s
(1h0m0s) = 1h0m0s

The above code allows us to calculate all corresponding durations as floating point integers.

Calculate running time using the time library

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

    var t time.Duration = 100000000000000
    fmt.Println(t.Hours())
    fmt.Println(t.Minutes())
    fmt.Println(t.Seconds())

    now := time.Now()
    time.Sleep(100000)
    diff := now.Sub(time.Now())

    fmt.Println("Elapsed time in seconds: ", diff.Seconds())
}

Output:

27.77777777777778
1666.6666666666667
100000
Elapsed time in seconds:  -0.0001

The elapsed time tells us how long it took the processor to calculate the duration.

Convert a duration to a number in Go

package main
import (
    "fmt"

    "time"
)
func main() {

timeInput := 3600

data := time.Duration(timeInput) * time.Millisecond

fmt.Println("The time in Nanoseconds:", int64(data/time.Nanosecond))

fmt.Println("The time in Microseconds:", int64(data/time.Microsecond))

fmt.Println("The time in Milliseconds:", int64(data/time.Millisecond))
}

Output:

The time in Nanoseconds: 3600000000
The time in Microseconds: 3600000
The time in Milliseconds: 3600

The above code allows us to convert a number to a time instance, then time.Duration performs the time conversion. Finally, the time instance is converted back to a number.