日期加减(Calendar)
package test;import java.text.SimpleDateFormat;import java.util.Calendar; import java.util.Date; public class DateCal { /*** @param args*/ public static void main(String[] args) throws Exception { /*** 当前日期*/Calendar cal = Calendar.getInstance(); cal.add(Calendar.DATE,-3); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); String now = sdf.format(cal.getTime()); System.out.println("当前时间:"+now); /** * 日期相减 */cal.set(2008, 01, 01); Date d1 = cal.getTime(); cal.set(2008, 03, 01); Date d2 = cal.getTime(); long daterange = d2.getTime() - d1.getTime(); long time = 1000*3600*24; //A day in millisecondsSystem.out.println("相差"+daterange/time+"天"); System.out.println("相差"+daterange/time/30+"个月");/** * 日期相加 */sdf = new SimpleDateFormat("yyyy-MM-dd");cal.setTime(sdf.parse("2008-01-01"));cal.add(Calendar.DAY_OF_MONTH, +5); String result = sdf.format(cal.getTime()); System.out.println("相加/减后的日期:"+result); }}返回结果:
当前时间:2008-01-05 09:50:37
相差60天
相差2个月
相加/减后的日期:2008-01-06
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