simple appengine go app that prints out the current time in Japan, Los Angeles & London/UTC

japan-timebot-simple.go

// http://japan-timebot-simple.appspot.com

package japantime

import (
	"fmt"
	"net/http"
	"time"
)

// constants
const (
	shortformat = "3:04pm"
)

// types
type times struct {
	jpn time.Time
	lax time.Time
	utc time.Time
}

func init() {
	// setup the http handlers
	http.HandleFunc("/", handler_redirect)
	http.HandleFunc("/time", handler_time)
}

// get the current time in JPN, LAX, UTC and return them in a struct of 3x t.Time
func getTime() times {
	var tzu times
	t := time.Now()
	// locations
	loc_lax, _ := time.LoadLocation("America/Los_Angeles")
	loc_jpn, _ := time.LoadLocation("Japan")
	loc_utc, _ := time.LoadLocation("UTC")
	// times
	tzu.lax = t.In(loc_lax)
	tzu.jpn = t.In(loc_jpn)
	tzu.utc = t.In(loc_utc)
	return tzu
}

// redirect
func handler_redirect(w http.ResponseWriter, r *http.Request) {
	http.Redirect(w, r, "http://japan-timebot-simple.appspot.com/time", 301)
}

// print the current time in Japan, LA, London/UTC
func handler_time(w http.ResponseWriter, r *http.Request) {
	var mytimes times
	mytimes = getTime()
	fmt.Fprintf(w, mytimes.jpn.Format(shortformat)+" in Japan ("+mytimes.lax.Format(shortformat)+" in Los Angeles,  "+mytimes.utc.Format(shortformat)+" in London/UTC)\n")
}