package util

import (
	"net/http"
	"time"
)

// ToClientTimezone converts given time to timezone set in a
// X-Client-Timezone header. If this header is not set, then
// converts to UTC.
func ToClientTimezone(t time.Time, r *http.Request) time.Time {
	if tz := r.Header.Get("X-Client-Timezone"); tz != "" {
		loc, err := time.LoadLocation(tz)
		if err != nil {
			return t.UTC()
		}
		return t.In(loc)
	}

	return t.UTC()
}