Boseji's JSON Time Server - Provides both GMT (Internet Time) and Local time in IST (Bharat Standard Time)

json-time-server.go

//
//     ॐ भूर्भुवः स्वः
//     तत्स॑वि॒तुर्वरे॑ण्यं॒
//    भर्गो॑ दे॒वस्य॑ धीमहि।
//   धियो॒ यो नः॑ प्रचो॒दया॑त्॥
//
//
// बोसजी के द्वारा रचित जेसोन समय सहायक तन्त्राक्ष्।
// ===================================
//
// एक सरल संचार सहायक और संलग्न तंत्र।
//
// ~~~~~~~~~~~~~~~~~~~~~~~
// एक रचनात्मक भारतीय उत्पाद।
// ~~~~~~~~~~~~~~~~~~~~~~~
//
// ___________________________
//
// Boseji's JSON Time Server
// ___________________________
//
// Provides both GMT (Internet Time) and Local time in IST (Bharat Standard Time).
//
// Sources
// --------
// https://gist.github.com/boseji/
//
//
// License
// --------
//
//   SPDX: Apache-2.0
//
//   Copyright (C) 2024 Abhijit Bose (aka. Boseji). All rights reserved.
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
//
//   SPDX short identifier: Apache-2.0

package main

import (
	"encoding/json"
	"fmt"
	"html"
	"log"
	"net/http"
	"os"
	"time"
	_ "time/tzdata" // Important! for Timezone Information
)

func main() {
	port := os.Getenv("PORT")
	if port == "" {
		port = "8080"
	}
	log.Println("Starting Server on Port: ", port)
	http.HandleFunc("/", hello)
	http.HandleFunc("/time", timeHandler)
	log.Fatalln(http.ListenAndServe(":"+port, nil))
}

func hello(w http.ResponseWriter, r *http.Request) {
	json.NewEncoder(w).Encode(
		map[string]string{
			"Greeting": fmt.Sprintf("Hari Aum from %q",
				html.EscapeString(r.URL.Path)),
		},
	)
}

func timeHandler(w http.ResponseWriter, _ *http.Request) {
	type tm struct {
		CurrentTime string `json:"current_time"`
		LocalTime   string `json:"local_time"`
	}
	location, _ := time.LoadLocation("Asia/Kolkata")
	ct := []tm{
		{
			CurrentTime: time.Now().Format(http.TimeFormat),
			// Compatible to Internet Time
			LocalTime: time.Now().In(location).Format(time.RFC1123),
		},
	}
	json.NewEncoder(w).Encode(ct)
}