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package era | ||
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import ( | ||
"fmt" | ||
"time" | ||
) | ||
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//era.eraName は元号名を表す型です。 | ||
type eraName int | ||
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const ( | ||
Unknown eraName = iota //不明な元号 | ||
Meiji //明治 | ||
Taisho //大正 | ||
Showa //昭和 | ||
Heisei //平成 | ||
Reiwa //令和 | ||
) | ||
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var eraString = map[eraName]string{ | ||
Unknown: "", | ||
Meiji: "明治", | ||
Taisho: "大正", | ||
Showa: "昭和", | ||
Heisei: "平成", | ||
Reiwa: "令和", | ||
} | ||
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//era.Name() 関数は元号の文字列から元号名 era.eraName を取得します。 | ||
//該当する元号名がない場合は era.Unknown を返します。 | ||
func Name(s string) eraName { | ||
for k, v := range eraString { | ||
if v == s { | ||
return k | ||
} | ||
} | ||
return Unknown | ||
} | ||
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func (e eraName) String() string { | ||
if s, ok := eraString[e]; ok { | ||
return s | ||
} | ||
return "" | ||
} | ||
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//err.Time は元号操作を含む時間クラスです。 | ||
type Time struct { | ||
time.Time | ||
} | ||
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var ( | ||
locJST = time.FixedZone("JST", 9*60*60) //日本標準時 | ||
eraTrigger = map[eraName]time.Time{ //各元号の起点 | ||
Meiji: time.Date(1873, time.January, 1, 0, 0, 0, 0, locJST), //明治(の改暦) : 1873-01-01 | ||
Taisho: time.Date(1912, time.July, 30, 0, 0, 0, 0, locJST), //大正 : 1912-07-30 | ||
Showa: time.Date(1926, time.December, 25, 0, 0, 0, 0, locJST), //昭和 : 1926-12-25 | ||
Heisei: time.Date(1989, time.January, 8, 0, 0, 0, 0, locJST), //平成 : 1989-01-08 | ||
Reiwa: time.Date(2019, time.May, 1, 0, 0, 0, 0, locJST), //令和 : 2019-05-01 | ||
} | ||
eraSorted = []eraName{Reiwa, Heisei, Showa, Taisho, Meiji} //ソートされた元号の配列(降順) | ||
) | ||
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//era.New() 関数は era.Time インスタンスを生成します。 | ||
func New(t time.Time) Time { | ||
return Time{t.In(locJST)} //日本標準時で揃える | ||
} | ||
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//era.Date() 関数は 元号・年・月・日・時・分・秒・タイムゾーン を指定して era.Time 型のインスタンスを返します。 | ||
//起点が定義されない元号を指定した場合は西暦として処理します。 | ||
func Date(en eraName, year int, month time.Month, day, hour, min, sec, nsec int, loc *time.Location) Time { | ||
ofset := 0 | ||
if dt, ok := eraTrigger[en]; ok { | ||
ofset = dt.Year() - 1 | ||
} | ||
return New(time.Date(year+ofset, month, day, hour, min, sec, nsec, loc)) | ||
} | ||
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//era.Time.Era() メソッドは元号名 era.eraName のインスタンスを返します。 | ||
//元号が不明の場合は era.Unknown を返します。 | ||
func (t Time) Era() eraName { | ||
for _, es := range eraSorted { | ||
if !t.Before(eraTrigger[es]) { | ||
return es | ||
} | ||
} | ||
return Unknown | ||
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} | ||
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//era.Time.YearEra() メソッドは元号付きの年の値を返します。 | ||
//元号が不明の場合は (era.Unknown, 0) を返します。 | ||
func (t Time) YearEra() (eraName, int) { | ||
era := t.Era() | ||
if era == Unknown { | ||
return Unknown, 0 | ||
} | ||
year := t.Year() - eraTrigger[era].Year() + 1 | ||
if era == Meiji { //明治のみ5年のオフセットを加算する | ||
return era, year + 5 | ||
} | ||
return era, year | ||
} | ||
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//era.Time.YearEraString() メソッドは元号付きの年の値を文字列で返します。 | ||
//元号が不明の場合は空文字列を返します。 | ||
func (t Time) YearEraString() (string, string) { | ||
era, year := t.YearEra() | ||
if era == Unknown || year < 1 { | ||
return "", "" | ||
} | ||
if year == 1 { | ||
return era.String(), "元年" | ||
} | ||
return era.String(), fmt.Sprintf("%d年", year) | ||
} | ||
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/* Copyright 2019-2022 Spiegel | ||
* | ||
* 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. | ||
*/ |
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