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使用Calendar.getInstance()不仅能获取当前的时间，还能指定需要获取的时间点，在项目应用中达到
定时的作用，下面是常用的一些指定时间点使用：
public class Test1 {
public static void main(String[]args){
System.out.println("时间为：\n"+getDate1()+"\n"+getDate2()+"\n"+getDate3()+"\n"+getDate4()+"\n"+getDate5());
}
/* Calendar.HOUR_OF_DAY 24小时制
Calendar.HOUR 12小时制*/
//获取当天0点时间
public static String getDate1(){
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 0);//控制时
cal.set(Calendar.MINUTE, 0);//控制分
cal.set(Calendar.SECOND, 0);//控制秒
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(cal.getTime());
}
//获取当天12点时间
public static String getDate2(){
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 12);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(cal.getTime());
}
//获取本周一0点时间
public static String getDate3(){
Calendar cal = Calendar.getInstance();
cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(cal.getTime());
}
//获取本月第一天0点时间
public static String getDate4(){
Calendar cal = Calendar.getInstance();
cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
cal.set(Calendar.DAY_OF_MONTH,cal.getActualMinimum(Calendar.DAY_OF_MONTH));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(cal.getTime());
}
//获得本月最后一天24点时间
public static String getDate5(){
Calendar cal = Calendar.getInstance();
cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
cal.set(Calendar.DAY_OF_MONTH,cal.getActualMaximum(Calendar.DAY_OF_MONTH));
cal.set(Calendar.HOUR_OF_DAY, 24);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(cal.getTime());
}
}
控制台输出如下：
参考链接：http://blog.csdn.net/holee_bk/article/details/53456630
