1、Calendar是Java提供的一个util类，在java.util中。我们在开发过程中经常遇到，需要对时间进行处理的方式。而Java中Calendar给我们提供了很好的控制方式。
2、我这里主要是介绍几种Calendar的操作方式来获取不同时间
public class CalendarUtil {
/**
* 获取当月第一天开始时间和最后一天结束时间
* @return
*/
public final static List<Long> getMonthStartAndEnd(){
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH,0);
calendar.set(Calendar.DAY_OF_MONTH,1);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
Long firstDay = calendar.getTime().getTime();
calendar.add(Calendar.MONTH,1);
Long lastDay = calendar.getTime().getTime()-1;
List<Long> times = new ArrayList<>();
times.add(firstDay);
times.add(lastDay);
return times;
}
/**
* 获取当天的开始时间
* @return
*/
public final static Long getDayStart(){
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH,0);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
return calendar.getTime().getTime();
}
/**
* 获取某天的开始时间
* @param day
* @return
*/
public final static Long getDayStart(Integer day){
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH,0);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
calendar.set(Calendar.DAY_OF_MONTH,day.intValue());
return calendar.getTime().getTime();
}
/**
* 获取某天的结束时间
* @param day
* @return
*/
public final static Long getDayEnd(Integer day){
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH,0);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
calendar.set(Calendar.DAY_OF_MONTH,day.intValue()+1);
return calendar.getTime().getTime()-1;
}
/**
* 获取本月或者次月某天的结束时间
* @param month
* @param day
* @return
*/
public final static Long getDayEnd(Integer month,Integer day){
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH,month.intValue());
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
calendar.set(Calendar.DAY_OF_MONTH,day.intValue()+1);
return calendar.getTime().getTime()-1;
}
/**
* 获取本季度的开始时间和结束时间
* @return
*/
public final static List<Long> getQuarterStartAndEnd(){
//获取时间
Calendar calendar = Calendar.getInstance();
//判读当前时间是哪个季度
int month = calendar.get(Calendar.MONTH)+1;
Integer quarter = 0;
if (month>=1 && month <=3) {
quarter = 1;
} else if (month>=4 && month <=6) {
quarter = 2;
} else if (month>=7 && month <=9) {
quarter = 3;
} else if (month>=10 && month <=12) {
quarter = 4;
}
calendar.set(Calendar.MONTH,3*(quarter.intValue()-1));
calendar.set(Calendar.DAY_OF_MONTH,1);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
Long firstDay = calendar.getTime().getTime();
calendar.add(Calendar.MONTH,3);
Long lastDay = calendar.getTime().getTime()-1;
List<Long> times = new ArrayList<>();
times.add(firstDay);
times.add(lastDay);
return times;
}
/**
* 获取每个季度第某个月，第某个天数的开始时间
* @return
*/
public final static List<Long> getQuarterStart(Integer month,Integer day){
List<Long> times = new ArrayList<>();
for (int i = 1; i <= 4; i++) {
//获取时间
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH,3*(i-1)-1+month.intValue());
calendar.set(Calendar.DAY_OF_MONTH,day);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
times.add(calendar.getTime().getTime());
}
return times;
}
/**
* 获取某个季度某个月，某天的结束时间
* @return
*/
public final static Long getQuarterEnd(Integer month,Integer day){
//获取时间
Calendar calendar = Calendar.getInstance();
//判读当前时间是哪个季度
int currentMonth = calendar.get(Calendar.MONTH)+1;
Integer quarter = 0;
if (currentMonth>=1 && currentMonth <=3) {
quarter = 1;
} else if (currentMonth>=4 && currentMonth <=6) {
quarter = 2;
} else if (currentMonth>=7 && currentMonth <=9) {
quarter = 3;
} else if (currentMonth>=10 && currentMonth <=12) {
quarter = 4;
}
calendar.set(Calendar.MONTH,3*(quarter.intValue()-1)+month.intValue());
calendar.set(Calendar.DAY_OF_MONTH,day+1);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
return calendar.getTime().getTime()-1;
}
/**
* 获取当年的开始时间和结束时间
* @return
*/
public final static List<Long> getYearStartAndEnd(){
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH,0);
calendar.set(Calendar.DAY_OF_MONTH,1);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
Long firstDay = calendar.getTime().getTime();
calendar.add(Calendar.MONTH,12);
Long lastDay = calendar.getTime().getTime()-1;
List<Long> times = new ArrayList<>();
times.add(firstDay);
times.add(lastDay);
return times;
}
/**
* 获取当前年第某个月，第某个天数的开始时间
* @return
*/
public final static Long getYearStart(Integer month,Integer day){
//获取时间
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH,month.intValue()-1);
calendar.set(Calendar.DAY_OF_MONTH,day.intValue());
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
return calendar.getTime().getTime();
}
/**
* 获取当前年第某个月，第某个天数的结束时间
* @return
*/
public final static Long getYearEnd(Integer month,Integer day){
//获取时间
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH,month.intValue()-1);
calendar.set(Calendar.DAY_OF_MONTH,day.intValue()+1);
calendar.set(Calendar.HOUR_OF_DAY,0);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND,0);
calendar.set(Calendar.MILLISECOND,0);
return calendar.getTime().getTime()-1;
}
}