XBar plugin to show local time in various timezones and difference with local time

001.locations.1m.go

// <xbar.title>Locations</xbar.title>
// <xbar.version>v1.0</xbar.version>
// <xbar.author>John Roberts</xbar.author>
// <xbar.author.github>johncalvinroberts</xbar.author.github>
// <xbar.desc>The script displays the time in different timezones</xbar.desc>
// <xbar.image>https://raw.githubusercontent.com/christophschlosser/bitbar-plugins/checkhosts/Network/checkhosts.png</xbar.image>
// <xbar.dependencies>go</xbar.dependencies>

package main

import (
	"fmt"
	"time"
)

// locations, refer to IANA timezone database
// https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
// https://www.iana.org/time-zones

var locations = [][]string{
	{"PVG", "Asia/Shanghai"},
	{"HND", "Asia/Tokyo"},
	{"PDX", "America/Los_Angeles"},
	{"SLC", "America/Boise"},
	{"MSP", "America/Chicago"},
	{"NY", "America/New_York"},
	{"CPH", "Europe/Copenhagen"},
}

const layout = "3:04pm, Jan 2"

func main() {
	var toprint string
	nowHere := time.Now()
	for _, tuple := range locations {
		key, value := tuple[0], tuple[1]
		// get local time
		// print key + local time + difference to current time
		loc, err := time.LoadLocation(value)
		var nextline string
		if err != nil {
			nextline = fmt.Sprintf("%s: %s", key, "error")
		} else {
			nowThere := time.Now().In(loc)
			nowThereButHere := time.Date(
				nowThere.Year(),
				nowThere.Month(),
				nowThere.Day(),
				nowThere.Hour(),
				nowThere.Minute(),
				nowThere.Second(),
				nowThere.Nanosecond(),
				nowHere.Location())
			offset := nowHere.Sub(nowThereButHere)
			nextline = fmt.Sprintf("%s: %s (%.0f hrs diff)", key, nowThere.Format(layout), offset.Hours())
		}
		toprint = fmt.Sprintf("%s%s\n", toprint, nextline)
	}
	fmt.Println(":earth_asia:")
	fmt.Println("---")
	fmt.Println(toprint)
	fmt.Println("Refresh | refresh=true")
}