hutool 日期时间工具-DateUtil
@Test
public void test1(){
//当前时间
Date date = DateUtil.date();
//当前时间
Date date2 = DateUtil.date(Calendar.getInstance());
//当前时间
Date date3 = DateUtil.date(System.currentTimeMillis());
//当前时间字符串，格式：yyyy-MM-dd HH:mm:ss
String now = DateUtil.now();
//当前日期字符串，格式：yyyy-MM-dd
String today= DateUtil.today();
System.out.println(date);
System.out.println(now);
System.out.println(date2);
System.out.println(date3);
System.out.println(today);
// 2021-11-18 15:33:33
// 2021-11-18 15:33:33
// 2021-11-18 15:33:33
// 2021-11-18 15:33:33
// 2021-11-18
}
@Test
public void test2(){
String dateStr = "2017-03-01";
Date date = DateUtil.parse(dateStr);
//结果 2017/03/01
String format = DateUtil.format(date, "yyyy/MM/dd");
//常用格式的格式化，结果：2017-03-01
String formatDate = DateUtil.formatDate(date);
//结果：2017-03-01 00:00:00
String formatDateTime = DateUtil.formatDateTime(date);
//结果：00:00:00
String formatTime = DateUtil.formatTime(date);
System.out.println(date);
System.out.println(format);
System.out.println(formatDate);
System.out.println(formatDateTime);
System.out.println(formatTime);
// 2017-03-01 00:00:00
// 2017/03/01
// 2017-03-01
// 2017-03-01 00:00:00
// 00:00:00
}
@Test
public void test3(){
Date date = DateUtil.date();
//获得年的部分
int year = DateUtil.year(date);
//获得月份，从0开始计数
int month = DateUtil.month(date);
//获得月份枚举
Month month1 = DateUtil.monthEnum(date);
int day = DateUtil.dayOfMonth(date);
//.....
System.out.println(date);
System.out.println(year);
System.out.println(month);
System.out.println(month1);
System.out.println(day);
// 2021-11-18 15:41:14
// 2021
// 10
// NOVEMBER
// 18
}
@Test
public void test4(){
String dateStr = DateUtil.now();
Date date = DateUtil.parse(dateStr);
//一天的开始，结果：2017-03-01 00:00:00
Date beginOfDay = DateUtil.beginOfDay(date);
//一天的结束，结果：2017-03-01 23:59:59
Date endOfDay = DateUtil.endOfDay(date);
System.out.println(beginOfDay);
System.out.println(endOfDay);
// 2021-11-18 00:00:00
// 2021-11-18 23:59:59
}
//时间偏移
@Test
public void test5(){
String dateStr = "2017-03-01 22:33:23";
Date date = DateUtil.parse(dateStr);
//结果：2017-03-03 22:33:23
Date newDate = DateUtil.offset(date, DateField.DAY_OF_MONTH, 2);
//常用偏移，结果：2017-03-04 22:33:23
DateTime newDate2 = DateUtil.offsetDay(date, 3);
//常用偏移，结果：2017-03-01 19:33:23
DateTime newDate3 = DateUtil.offsetHour(date, -3);
//昨天
DateTime yesterday = DateUtil.yesterday();
//明天
DateUtil.tomorrow();
//上周
DateUtil.lastWeek();
//下周
DateUtil.nextWeek();
//上个月
DateUtil.lastMonth();
//下个月
DateUtil.nextMonth();
System.out.println(yesterday);
//2021-11-17 15:58:18
}
//计算时间差
@Test
public void test6(){
String dateStr1 = "2017-03-01 22:33:23";
Date date1 = DateUtil.parse(dateStr1);
String dateStr2 = "2017-04-01 23:33:23";
Date date2 = DateUtil.parse(dateStr2);
//相差一个月，天,小时,分秒可以修改后面的day实现
long betweenDay = DateUtil.between(date1, date2, DateUnit.DAY);
System.out.println(betweenDay);
}
//计算时间差 格式化时间差
@Test
public void test7(){
String dateStr1 = "2017-03-01 22:33:23";
Date date1 = DateUtil.parse(dateStr1);
String dateStr2 = "2017-04-01 23:30:20";
Date date2 = DateUtil.parse(dateStr2);
//相差一个月，天,小时,分秒可以修改后面的day实现
long betweenDay = DateUtil.between(date1, date2, DateUnit.DAY);
System.out.println(betweenDay);
//表示精确到分
String formatBetween = DateUtil.formatBetween(date2, date1,BetweenFormatter.Level.SECOND);
//输出：31天56分57秒
Console.log(formatBetween);
}
//年龄 是否闰年
@Test
public void test8(){
//年龄
DateUtil.ageOfNow("1990-01-30");
//是否闰年
DateUtil.isLeapYear(2017);
}
@Test
public void test11(){
TimeInterval timer = DateUtil.timer();
DateTime of = DateTime.of(new Date());
Console.log(of);
//2021-11-18 16:35:11
Console.log(of.toString("yyyy-MM-dd"));
Console.log("花费毫秒数:{}",timer.interval());//花费毫秒数
Console.log(timer.intervalRestart());//返回花费时间，并重置开始时间
Console.log(timer.intervalMinute());//花费分钟数
}
@Test
public void test12(){
String dateStr = "2017-03-01";
Object[] a = { "a", "你", "好", "", 1 };
//转化时间格式
Date date = Convert.toDate(dateStr);
Console.log(date);
//转化为任意类型
List<?> objects = Convert.convert(List.class,a);
//毫秒转化为对应多少分钟
long c= 4535345;
//结果为：75
long minutes = Convert.convertTime(c, TimeUnit.MILLISECONDS, TimeUnit.MINUTES);
//金钱转化为大写
double d = 67556.32;
//结果为："陆万柒仟伍佰伍拾陆元叁角贰分"
String digitUppercase = Convert.digitToChinese(d);
//自定义转化
int f = 3423;
ConverterRegistry converterRegistry = ConverterRegistry.getInstance();
String result = converterRegistry.convert(String.class, f);
Console.log(result);
//转化其他类型
Console.log(Convert.toBigDecimal(f,new BigDecimal(0.00)));
}