java 得到指定日期的起始时间

时间 2019-12-10

标签 java 得到指定日期起始时间栏目 Java 繁體版

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项目中常常会遇到得到指定日期的起止时间，如得到当月的起始时间和结束时间。以前已经讲过在前段的实现。如今咱们看看在java后端如何实现。java

主要借助Calendar类实现。后端

得到一日的起始和结束时间：get

Calendar now = Calendar.getInstance();
now.setTime(date);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
now.set(Calendar.MILLISECOND, 0);
Date beginOfDay = now.getTime();
now.add(Calendar.DAY_OF_YEAR, 1);
now.add(Calendar.MILLISECOND, -1);
Date endOfDay = now.getTime();

Mon Jan 07 00:00:00 CST 2019
Mon Jan 07 23:59:59 CST 2019date

得到一周的起始和结束时间：im

Calendar now = Calendar.getInstance();
now.setTime(date);
now.set(Calendar.DAY_OF_WEEK, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
now.set(Calendar.MILLISECOND, 0);
Date beginOfWeek = now.getTime();
now.add(Calendar.WEEK_OF_YEAR, 1);
now.add(Calendar.MILLISECOND, -1);
Date endOfWeek = now.getTime();

Sun Jan 06 00:00:00 CST 2019
Sat Jan 12 23:59:59 CST 2019项目

得到一个月的起始和结束时间：时间

Calendar now = Calendar.getInstance();
now.setTime(date);
now.set(Calendar.DAY_OF_MONTH, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
now.set(Calendar.MILLISECOND, 0);
Date beginOfMon = now.getTime();
now.add(Calendar.MONTH, 1);
now.add(Calendar.MILLISECOND, -1);
Date endOfMon = now.getTime();

Tue Jan 01 00:00:00 CST 2019
Thu Jan 31 23:59:59 CST 2019日期

得到一年的起始和结束时间：

Calendar now = Calendar.getInstance();
now.setTime(date);
now.set(Calendar.MONTH, 0);
now.set(Calendar.DAY_OF_YEAR, 1);
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
now.set(Calendar.MILLISECOND, 0);
Date beginOfYear = now.getTime();
now.add(Calendar.YEAR, 1);
now.add(Calendar.MILLISECOND, -1);
Date endOfYear = now.getTime();

Tue Jan 01 00:00:00 CST 2019 Tue Dec 31 23:59:59 CST 2019