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?

From Wikipedia on ISO 8601 durations:

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

Suchta

Parsing date/time strings is very well documented in Go. What have you tried? What problems did you encounter? – Cultivation

This question is particularly about ISO 8601 duration that is not supported in std lib. – Heiress

KeyB0rys, here is an example play.golang.org/p/guybDGoJVrT with 3rd party lib. – Heiress

Answer 1

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
}

Heiress

The issue here is it doesn't give you an actual time.Duration. It has it however it's not exported. – Overarm

Answer 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

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