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  • Java——日期格式化YYYYMMdd与yyyyMMdd的区别

        public static void main(String[] args) {
            //YYYY 是表示:当天所在的周属于的年份,一周从周日开始,周六结束,只要本周跨年,那么这周就算入下一年。
            //2019-12-29至2020-1-4跨年周
            Calendar calendar = Calendar.getInstance();
            //2019-12-28
            calendar.set(2019, Calendar.DECEMBER, 28);  
            Date strDate1 = calendar.getTime(); 
            //2019-12-29
            calendar.set(2019, Calendar.DECEMBER, 29);  
            Date strDate2 = calendar.getTime(); 
            // 2019-12-31  
            calendar.set(2019, Calendar.DECEMBER, 31);  
            Date strDate3 = calendar.getTime();  
            // 2020-01-01  
            calendar.set(2020, Calendar.JANUARY, 1);  
            Date strDate4 = calendar.getTime();  
            
            DateFormat df1 = new SimpleDateFormat("yyyyMMdd");
            DateFormat df2 = new SimpleDateFormat("YYYYMMdd");
            //yyyyMMdd
            System.out.println("yyyyMMdd");
            System.out.println("2019-12-28: " + df1.format(strDate1)); 
            System.out.println("2019-12-29: " + df1.format(strDate2)); 
            System.out.println("2019-12-31: " + df1.format(strDate3));  
            System.out.println("2020-01-01: " + df1.format(strDate4));  
            //YYYYMMdd
            System.out.println("YYYYMMdd");
            System.out.println("2019-12-28: " + df2.format(strDate1));
            System.out.println("2019-12-29: " + df2.format(strDate2));
            System.out.println("2019-12-31: " + df2.format(strDate3));  
            System.out.println("2020-01-01: " + df2.format(strDate4));
        }

    结果:

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  • 原文地址:https://www.cnblogs.com/it-mh/p/12155400.html
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