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                [https://v2ex.com/t/633650](https://v2ex.com/t/633650) `YYYY`是`week-based-year`,表示:當天所在的周屬于的年份,一周從周日開始,周六結束,只要本周跨年,那么這周就算入下一年。所以2019年12月31日那天在這種表述方式下就已經 2020 年了。 而當使用`yyyy`的時候,就還是 2019 年 ~~~ Date date = new Date(1577754000000L); DateFormat df1= new SimpleDateFormat("yyyy-MM-dd");//對日期進行格式化 String format = df1.format(date); System.out.println(format); //2019-12-31 //------------------ DateFormat df2 = new SimpleDateFormat("YYYY-MM-dd");//對日期進行格式化 String format1 = df2.format(date); System.out.println(format1); //2020-12-31 ~~~
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                              哎呀哎呀视频在线观看