small get time api using mux

app.go

package app

import (
	"github.com/gorilla/mux"
	"log"
	"net/http"
)

func Start() {

	route := mux.NewRouter()

	//routes
	route.HandleFunc("/api/time", getTime).Methods("GET")

	//start
	log.Fatal(http.ListenAndServe(":8080", route))
}

go.mod

module github.com/m0rais/time

go 1.23

require github.com/gorilla/mux v1.8.1 // indirect

handlers.go

package app

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strings"
	"time"
)

func getTime(writer http.ResponseWriter, request *http.Request) {
	tz := request.URL.Query().Get("tz")

	if tz == "" {
		currentTime := time.Now().UTC()
		fmt.Fprint(writer, currentTime.Format(time.RFC1123))
		return
	}

	response := make(map[string]string)
	for _, zone := range strings.Split(tz, ",") {
		location, err := time.LoadLocation(zone)

		if err != nil {
			writer.WriteHeader(http.StatusNotFound)
			fmt.Fprint(writer, zone)
			return
		}

		response[zone] = time.Now().In(location).Format(time.RFC1123)
	}

	writer.Header().Set("Content-Type", "application/json")
	json.NewEncoder(writer).Encode(response)
}

main.go

package main

import "github.com/m0rais/time/app"

func main() {

	app.Start()

}