package sms;
import com.alibaba.fastjson.JSONObject;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.DateUtils;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Date_02 {
public static void main(String[] args) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
Date now = new Date();
Calendar cal = Calendar.getInstance();
cal.setFirstDayOfWeek(Calendar.MONDAY);
//获取本星期第1天
cal.setTime(now);
int wich = cal.get(Calendar.DAY_OF_WEEK);
System.out.println(wich);
cal.add(Calendar.WEEK_OF_YEAR, -1);
Date time = cal.getTime();
System.out.println(sdf.format(now));
/*
2020-03-01 14:11:15.420
2020-03-01 00:00:00.000
2020-03-01 00:00:00.000
2020-03-01 14:00:00.000
2020-03-01 14:11:00.000
*/
System.out.println(sdf.format(DateUtils.truncate(now, Calendar.MONTH)));
System.out.println(sdf.format(DateUtils.truncate(now, Calendar.DAY_OF_MONTH)));
System.out.println(sdf.format(DateUtils.truncate(now, Calendar.HOUR)));
System.out.println(sdf.format(DateUtils.truncate(now, Calendar.MINUTE)));
//格式化日期
String str = DateFormatUtils.format(now, "yyyyMMdd");
System.out.println(str);
System.out.println(JSONObject.toJSONString(time));
}
}
commons lang3 日期处理
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转载自www.cnblogs.com/mozq/p/12389631.html
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