// java时间获取类
public class DateUtil {
// 获取当前时间
public static Date getNowTime() {
Calendar calendar = Calendar.getInstance();
return calendar.getTime();
}
// 获得当天0点时间
public static Date getTodayStartTime() {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTime();
}
// 获得明天0点时间
public static Date getTomorrowStartTime() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, 1);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTime();
}
//获取某天的结束时间
public static Date getDayLastTime(int year, int month, int day) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month-1);
cal.set(Calendar.DAY_OF_MONTH, day);
cal.set(Calendar.HOUR_OF_DAY, cal.getActualMaximum(Calendar.HOUR_OF_DAY));
cal.set(Calendar.SECOND, cal.getActualMaximum(Calendar.SECOND));
cal.set(Calendar.MINUTE, cal.getActualMaximum(Calendar.MINUTE));
cal.set(Calendar.MILLISECOND, cal.getActualMaximum(Calendar.MILLISECOND));
return cal.getTime();
}
// 获得本月第一天0点时间
public static Date getMonthStartTime() {
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));
return cal.getTime();
}
// 获得本月最后一天的最后时间
public static Date getMonthLastTime() {
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, cal.getActualMaximum(Calendar.HOUR_OF_DAY));
cal.set(Calendar.SECOND, cal.getActualMaximum(Calendar.SECOND));
cal.set(Calendar.MINUTE, cal.getActualMaximum(Calendar.MINUTE));
cal.set(Calendar.MILLISECOND, cal.getActualMaximum(Calendar.MILLISECOND));
return cal.getTime();
}
//获取指定年月的第一天
public static Date getFirstDayOfMonth(int year, int month) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month-1);
//获取某月最小天数
int firstDay = cal.getMinimum(Calendar.DATE);
//设置日历中月份的最小天数
cal.set(Calendar.DAY_OF_MONTH, firstDay);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTime();
}
//获取指定年月的最后一天
public static Date getLastDayOfMonth(int year, int month) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month-1);
//获取某月最大天数
int lastDay = cal.getActualMaximum(Calendar.DATE);
//设置日历中月份的最大天数
cal.set(Calendar.DAY_OF_MONTH, lastDay);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTime();
}
// 判断是否为周末
public static boolean isWeekend(String date) throws ParseException {
DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
Date date1 = format1.parse(date);
Calendar cal = Calendar.getInstance();
cal.setTime(date1);
if((cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY) || (cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)) {
return true;
} else {
return false;
}
}
}
// 测试类
public class DateTest {
public static void main(String[] args) throws Exception {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println("获取当前时间：" + format.format(DateUtil.getNowTime()));
System.out.println("获得当天0点时间：" + format.format(DateUtil.getTodayStartTime()));
System.out.println("获得明天0点时间：" + format.format(DateUtil.getTomorrowStartTime()));
System.out.println("获取某天的结束时间：" + format.format(DateUtil.getDayLastTime(2020, 1, 25)));
System.out.println("获得本月第一天0点时间：" + format.format(DateUtil.getMonthStartTime()));
System.out.println("获得本月最后一天的最后时间：" + format.format(DateUtil.getMonthLastTime()));
System.out.println("获取指定年月的第一天：" + format.format(DateUtil.getFirstDayOfMonth(2020, 2)));
System.out.println("获取指定年月的最后一天：" + format.format(DateUtil.getLastDayOfMonth(2020, 2)));
System.out.println("判断是否为周末：" + DateUtil.isWeekend(format.format(DateUtil.getNowTime())));
}
}
原文地址：https://www.cnblogs.com/clgmxxh/p/12210898.html