几个时间计算

/**
* 获取前几天
* @param date
* @return
*/
public static Date getBeforeDate(Date date,int dates) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
calendar.setTime(date);

calendar.add(calendar.DATE, -dates);

return str2Date(date2Str(calendar.getTime()));
}

/**
* 获取后几天
* @param date
* @return
*/
public static Date getAfterDate(Date date,int dates) {
Calendar now =Calendar.getInstance();
now.setTime(date);
now.set(Calendar.DATE,now.get(Calendar.DATE)+dates);
return now.getTime();
}

/**
* 获取上周第一天（周一）
*
* @param date
* @return
* @throws Exception
*/
public static Date getLastWeekStart(Date date) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
calendar.setTime(date);
int i = calendar.get(calendar.DAY_OF_WEEK) - 1;
int startnum = 0;
if (i == 0) {
startnum = 7 + 6;
} else {
startnum = 7 + i - 1;
}
calendar.add(calendar.DATE, -startnum);

return str2Date(date2Str(calendar.getTime()));
}

/**
* 获取上周最后一天（周末）
*
* @param date
* @return
* @throws Exception
*/
public static Date getLastWeekEnd(Date date) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
calendar.setTime(date);
int i = calendar.get(calendar.DAY_OF_WEEK) - 1;
int endnum = 0;
if (i == 0) {
endnum = 7;
} else {
endnum = i;
}
calendar.add(calendar.DATE, -(endnum - 1));

return str2Date(date2Str(calendar.getTime()));
}

 

/**
* haoxw 比较时间是否在这两个时间点之间
*
* @param time1
* @param time2
* @return
*/
public static boolean checkTime(String time1, String time2) {
Calendar calendar = Calendar.getInstance();
Date date1 = calendar.getTime();
Date date11 = DateUtil.str2Date(DateUtil.date2Str(date1, "yyyy-MM-dd") + " " + time1);// 起始时间

Calendar c = Calendar.getInstance();
c.add(Calendar.DATE, 1);
Date date2 = c.getTime();
Date date22 = DateUtil.str2Date(DateUtil.date2Str(date2, "yyyy-MM-dd") + " " + time2);// 终止时间

Calendar scalendar = Calendar.getInstance();
scalendar.setTime(date11);// 起始时间

Calendar ecalendar = Calendar.getInstance();
ecalendar.setTime(date22);// 终止时间

Calendar calendarnow = Calendar.getInstance();

if (calendarnow.after(scalendar) && calendarnow.before(ecalendar)) {
return true;
} else {
return false;
}

}

/**
* haoxw 比较时间是否在这两个时间点之间
*
* @param date11
* @param date22
* @return
*/
public static boolean checkTime(Date date11, Date date22) {

Calendar scalendar = Calendar.getInstance();
scalendar.setTime(date11);// 起始时间

Calendar ecalendar = Calendar.getInstance();
ecalendar.setTime(date22);// 终止时间

Calendar calendarnow = Calendar.getInstance();

if (calendarnow.after(scalendar) && calendarnow.before(ecalendar)) {
return true;
} else {
return false;
}

}