Parse ISO 8601 time duration using Go (for instance PT90M)

Question

Is there any easy way to convert an ISO 8601 string time duration (P(n)Y(n)M(n)DT(n)H(n)M(n)S) to time.Duration?

For example, "P3Y6M4DT12H30M5S" represents a duration of "three years, six months, four days, twelve hours, thirty minutes, and five seconds".

Parsing date/time strings is very well documented in Go. What have you tried? What problems did you encounter? — Jonathan Hall, Nov 03 '20 at 21:41
This question is particularly about ISO 8601 duration that is not supported in std lib. — vearutop, Nov 03 '20 at 21:45
KeyB0rys, here is an example https://play.golang.org/p/guybDGoJVrT with 3rd party lib. — vearutop, Nov 03 '20 at 21:51

score 8 · Accepted Answer · answered Nov 03 '20 at 21:55

There is no API in standard library for that, but there is a 3rd party library that can add ISO 8601 duration to a time.Time: https://godoc.org/github.com/senseyeio/duration#Duration.Shift.

ISO 8601 duration can not be generally converted to a time.Duration because it depends on the base time.Time.

https://play.golang.org/p/guybDGoJVrT

package main

import (
    "fmt"
    "time"

    "github.com/senseyeio/duration"
)

func main() {
    d, _ := duration.ParseISO8601("P1D")
    today := time.Now()
    tomorrow := d.Shift(today)
    fmt.Println(today.Format("Jan _2"))    // Nov 11
    fmt.Println(tomorrow.Format("Jan _2")) // Nov 12
}

The issue here is it doesn't give you an actual `time.Duration`. It has it however it's not exported. — Elan Hasson, Jun 14 '23 at 00:11

score 2 · Answer 2 · answered Jan 24 '22 at 05:38

2

Finding existing solutions less than satisfactory I created my own module to parse ISO 8601 durations and convert them directly to a time.Duration. I hope you find it useful. :)

example usage: https://go.dev/play/p/Nz5akjy1c6W

answered Jan 24 '22 at 05:38

SimplySerenity

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Parse ISO 8601 time duration using Go (for instance PT90M)

2 Answers2