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Goで日本語曜日を含む日付format

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Goに限った話じゃないけど、日本語の曜日(月, 火, 水...)を表示したいときは、先に言語公式の機能でformatしてしまい、英語の曜日を文字列置換で置き換えるとコードがきれいになる。(効率的には文字列置換は重いと思うけど、読みやすさはだいぶ上がると思う)

package main

import (
	"fmt"
	"time"
	"strings"
)

func main() {
	t := time.Now()
	weekdayja := strings.NewReplacer(
		"Sun", "日",
		"Mon", "月",
		"Tue", "火",
		"Wed", "水",
		"Thu", "木",
		"Fri", "金",
		"Sat", "土",
	)
	fmt.Println(weekdayja.Replace(t.Format("2006年1月2日(Mon曜日)")))
	// 2009年11月10日(火曜日)
}

Goで複数の文字の組を一括置換したいときは、Replacerを使うとよいようだ。
https://golang.org/pkg/strings/#NewReplacer

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