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Swiftで日付の形式を変換する

Posted at

RSSなどのデータで見かける以下の形式の日付データ

Sat, 02 May 2015 12:04:27 +0900

上記のこの形式の日付文字列を

2015/05/02 12:04

上記の形式に直します

func convertDateFormat(dateStr:String) -> String {
    // 引数で渡ってきた文字列をNSDateFormatterでNSDateに直します
    let inFormatter = NSDateFormatter()
    inFormatter.dateFormat = "EEE, dd MM yyyy HH:mm:ss Z"
    let date:NSDate = inFormatter.dateFromString(dateStr)!
    
    // NSDateから指定のフォーマットの文字列に変換します
    let outFormatter = NSDateFormatter()
    outFormatter.dateFormat = "yyyy/MM/dd HH:mm"
    
    return outFormatter.stringFromDate(date)
}

NSDateFormatterに渡す形式

  • yyyy : 年
  • MMM 月
  • dd : 日
  • EEE 曜日
  • HH : 時
  • mm : 分
  • ss : 秒
  • Z : 時差
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