GoLang custom time.Duration to parse from JSON/YAML

main.go

package main

import (
	"encoding/json"
	"fmt"
	"time"
)

type MyDuration time.Duration

func (d *MyDuration) UnmarshalJSON(data []byte) error {
	var durationStr string
	if err := json.Unmarshal(data, &durationStr); err != nil {
		return err
	}

	parsedDuration, err := time.ParseDuration(durationStr)
	if err != nil {
		return err
	}

	*d = MyDuration(parsedDuration)
	return nil
}

func (d *MyDuration) ToTimeDuration() time.Duration {
	return time.Duration(*d)
}

type MyStruct struct {
	Duration MyDuration `json:"duration"`
}

func main() {
	jsonData := `{"duration": "2m30s"}`
	var jsonParsed MyStruct
	err := json.Unmarshal([]byte(jsonData), &jsonParsed)
	if err != nil {
		fmt.Println("json.Unmarshal Error:", err)
		return
	}

	fmt.Println("Parsed Duration (as MyDuration) nanoseconds:", jsonParsed.Duration)
	fmt.Println("Parsed Duration (as time.Duration) nanoseconds:", jsonParsed.Duration)
	fmt.Println("Parsed Duration (as time.Duration) string:", jsonParsed.Duration.ToTimeDuration().String())
	time.Sleep(jsonParsed.Duration.ToTimeDuration())
}