time.go

package asn1

import (
	"reflect"
	"time"
)

var (
	timeType = reflect.TypeOf(time.Time{})
)

func encodeUTCTime(value reflect.Value) ([]byte, error) {
	if value.Type() != timeType {
		return nil, invalidTypeError("time.Time", value)
	}
	t := value.Interface().(time.Time)
	// https://datatracker.ietf.org/doc/html/rfc5280#section-4.1.2.5.1
	utcTime := t.UTC().Format("060102150405Z")
	return []byte(utcTime), nil
}

func encodeGeneralizedTime(value reflect.Value) ([]byte, error) {
	if value.Type() != timeType {
		return nil, invalidTypeError("time.Time", value)
	}
	t := value.Interface().(time.Time)
	// https://datatracker.ietf.org/doc/html/rfc5280#section-4.1.2.5.2
	generalizedTime := t.UTC().Format("20060102150405Z")
	return []byte(generalizedTime), nil
}