核心是借助Calendar类,可以针对每个时间单位(如:年、月、日 ........ 毫秒),进行操作(添加与制定),然后重新获得设置后的时间!
如果想要了解Calendar 可以参考 https://www.zanglikun.com/2551.html#calendar%E7%B1%BB
线程不安全的原因:GregorianCalendar不是因为它继承了非线程安全的字段和方法.
解决方案就是ThreadLocal
public class ThreadSafeCalendar {
private static final ThreadLocal<Calendar> calendar = new ThreadLocal<Calendar>() {
@Override
protected Calendar initialValue() {
return Calendar.getInstance();
}
};
public static Date addDays(Date date, int days) {
Calendar cal = calendar.get();
cal.setTime(date);
cal.add(Calendar.DAY_OF_MONTH, days);
return cal.getTime();
}
}
import java.util.Calendar;
public class TimeUtils {
/**
* 获取昨天的开始其实时间戳
* @return
*/
public static Long getYesterdayStartTime() {
Calendar todayStart = Calendar.getInstance();
todayStart.set(Calendar.HOUR_OF_DAY, 0);
todayStart.set(Calendar.MINUTE, 0);
todayStart.set(Calendar.SECOND, 0);
todayStart.set(Calendar.MILLISECOND, 0);
long timeInMillis = todayStart.getTimeInMillis() - 86400000;
return timeInMillis;
}
/**
* 获取昨天的结束时间戳
* @return
*/
public static Long getYesterdayEndTime() {
Calendar todayEnd = Calendar.getInstance();
todayEnd.set(Calendar.HOUR_OF_DAY, 23);
todayEnd.set(Calendar.MINUTE, 59);
todayEnd.set(Calendar.SECOND, 59);
todayEnd.set(Calendar.MILLISECOND, 999);
long timeInMillis = todayEnd.getTimeInMillis() - 86400000;
return timeInMillis;
}
/**
* 获取今天的起始时间戳
* @return
*/
public static Long getTodayStartTime() {
Calendar todayStart = Calendar.getInstance();
todayStart.set(Calendar.HOUR_OF_DAY, 0);
todayStart.set(Calendar.MINUTE, 0);
todayStart.set(Calendar.SECOND, 0);
todayStart.set(Calendar.MILLISECOND, 0);
return todayStart.getTimeInMillis();
}
/**
* 获取今天的结束时间戳
* @return
*/
public static Long getTodayEndTime() {
Calendar todayEnd = Calendar.getInstance();
todayEnd.set(Calendar.HOUR_OF_DAY, 23);
todayEnd.set(Calendar.MINUTE, 59);
todayEnd.set(Calendar.SECOND, 59);
todayEnd.set(Calendar.MILLISECOND, 999);
return todayEnd.getTimeInMillis();
}
/**
* 获取上周周一时间戳
* @return
*/
public static Long getLastMondayTime() {
Calendar cal = Calendar.getInstance();
// 将每周第一天设为星期一,默认是星期天
cal.setFirstDayOfWeek(Calendar.MONDAY);
cal.add(Calendar.DATE, -1 * 7);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTimeInMillis();
}
/**
* 获取上周周日时间戳
* @return
*/
public static Long getLastSundayTime() {
Calendar cal = Calendar.getInstance();
//将每周第一天设为星期一,默认是星期天
cal.setFirstDayOfWeek(Calendar.MONDAY);
cal.add(Calendar.DATE, -7);
cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
cal.set(Calendar.HOUR_OF_DAY, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);
cal.set(Calendar.MILLISECOND, 999);
return cal.getTimeInMillis();
}
/**
* 获取本月开始时间戳
* @return String
* **/
public static Long getThisMonthStartTime(){
Calendar cal=Calendar.getInstance();
cal.add(Calendar.MONTH, 0);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTimeInMillis();
}
/**
* 获取本月最后一天时间戳
* @return String
* **/
public static Long getThisMonthEndDayTime(){
Calendar cal=Calendar.getInstance();
cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
cal.set(Calendar.HOUR_OF_DAY, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);
cal.set(Calendar.MILLISECOND, 999);
return cal.getTimeInMillis();
}
/**
* 获取本周的第一天时间戳
* @return String
* **/
public static Long getThisWeekStartTime(){
Calendar cal = Calendar.getInstance();
// 将每周第一天设为星期一,默认是星期天
cal.setFirstDayOfWeek(Calendar.MONDAY);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTimeInMillis();
}
/**
* 获取本周的最后一天时间戳
* @return String
* **/
public static Long getThisWeekEndTime(){
Calendar cal = Calendar.getInstance();
//将每周第一天设为星期一,默认是星期天
cal.setFirstDayOfWeek(Calendar.MONDAY);
cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
cal.set(Calendar.HOUR_OF_DAY, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);
cal.set(Calendar.MILLISECOND, 999);
return cal.getTimeInMillis();
}
}
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