java 天干地去标准类库

https://6tail.cn/calendar/api.html#start.html

// maven
<dependency>
  <groupId>cn.6tail</groupId>
  <artifactId>lunar</artifactId>
  <version>1.2.28</version>
</dependency>

// gradle
implementation 'com.github.6tail:lunar-java:v1.2.28'

import com.nlf.calendar.Lunar;
import com.nlf.calendar.Solar;
import com.nlf.calendar.util.HolidayUtil;
System.out.println(Lunar.fromDate(new Date()).toFullString());
System.out.println(Solar.fromYmd(2016, 1, 1).toFullString());
System.out.println(HolidayUtil.getHoliday(2020, 5, 2));