为支持日常工作需要，记录所用到的一些关于时间的工具类方法。随时进行补充。
java
/**
* Description:获取两个日期之间的天数差
* @Author:hanyq
* @Date:2023/9/19 11:23
*/
public static int getDateDifference(Date startDate,Date endDate){
int days = 0;
try {
Calendar startCalendar = Calendar.getInstance();
startCalendar.setTime(startDate);
Calendar endCalendar = Calendar.getInstance();
endCalendar.setTime(endDate);
//计算两个日期相差的天数
//startCalendar.getTime().getTime()返回long毫秒数形式,毫秒转为秒所以除以1000
//1天=24小时，1小时=60分，1分=60秒，所以两个时间的差再除以60 * 60 * 24换算成天的形式
days = ((int) (startCalendar.getTime().getTime() / 1000) - (int) (endCalendar.getTime().getTime() / 1000)) / (60 * 60 * 24);
} catch (Exception e) {
e.printStackTrace();
}
return days;
}
/**
* 比较两个时间大小(当时间A大于等于时间B时会返回false;反之时间A小于时间B时会返回true)
* @param startDate 时间A
* @param endDate 时间B
* @return
*/
public static Boolean compareDate(Date startDate,Date endDate){
Boolean result = false;
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
try {
result = startDate.after(endDate);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 获取当前日期对应的一周的开始日期
* @param date
* @return
*/
public static Calendar getFirstDayOfWeek(Date date){
Calendar result = null;
try{
Calendar calendarIndex = Calendar.getInstance();
calendarIndex.setTime(date);
//先判断该日期是否是周日，如果是的话将其减一(西方周六为一周结束，而我们以周日为一周结束)
LocalDate weekHandle = LocalDate.of(calendarIndex.get(Calendar.YEAR), calendarIndex.get(Calendar.MONTH) + 1, calendarIndex.get(Calendar.DATE));
int week = weekHandle.getDayOfWeek().getValue();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
if (week == 7){
calendar.add(Calendar.DAY_OF_MONTH, -1);
}
calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMinimum(Calendar.DAY_OF_WEEK));
calendar.add(Calendar.DAY_OF_MONTH, 1);
result = calendar;
}catch (Exception e){
e.printStackTrace();
}finally {
return result;
}
}
/**
* 获取当前日期对应的一周的结束日期
* @param date
* @return
*/
public static Calendar getLastDayOfWeek(Date date){
Calendar result = null;
try{
Calendar calendarIndex = Calendar.getInstance();
calendarIndex.setTime(date);
//先判断该日期是否是周日，如果是的话将其减一(西方周六为一周结束，而我们以周日为一周结束)
LocalDate weekHandle = LocalDate.of(calendarIndex.get(Calendar.YEAR), calendarIndex.get(Calendar.MONTH) + 1, calendarIndex.get(Calendar.DATE));
int week = weekHandle.getDayOfWeek().getValue();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
if (week == 7){
calendar.add(Calendar.DAY_OF_MONTH, -1);
}
calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMaximum(Calendar.DAY_OF_WEEK));
calendar.add(Calendar.DAY_OF_MONTH, 1);
result = calendar;
}catch (Exception e){
e.printStackTrace();
}finally {
return result;
}
}
/**
* Description:获取当时间所属月份开始时间
* @Author:hanyq
* @Date:2023/10/17 17:39
*/
public static Calendar getFirstDayOfMonth(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_MONTH, 1);
return calendar;
}
/**
* Description:获取当时间所属月份结束时间
* @Author:hanyq
* @Date:2023/10/17 17:39
*/
public static Calendar getLastDayOfMonth(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
return calendar;
}
/**
* Description:获取当时间所属年份开始时间
* @Author:hanyq
* @Date:2023/10/17 17:50
*/
public static Calendar getFirstDayOfYear(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_YEAR, 1);
return calendar;
}
/**
* Description:获取当时间所属年份结束时间
* @Author:hanyq
* @Date:2023/10/17 17:50
*/
public static Calendar getLastDayOfYear(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_YEAR, calendar.getActualMaximum(Calendar.DAY_OF_YEAR));
return calendar;
}