java 获取当前年份 月份,当月第一天和最后一天
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2022-05-02 16:01:44
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java 获取当前年份、月份以及当月第一天和最后一天:
package com.bsoft.test; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class CalendarTest { public static void main(String[] args) { //1、 获取当前年份、月份、日期 Calendar cale = null; cale = Calendar.getInstance(); int year = cale.get(Calendar.YEAR); int month = cale.get(Calendar.MONTH) + 1; int day = cale.get(Calendar.DATE); int hour = cale.get(Calendar.HOUR_OF_DAY); int minute = cale.get(Calendar.MINUTE); int second = cale.get(Calendar.SECOND); int dow = cale.get(Calendar.DAY_OF_WEEK); int dom = cale.get(Calendar.DAY_OF_MONTH); int doy = cale.get(Calendar.DAY_OF_YEAR); System.out.println("Current Date: " + cale.getTime()); System.out.println("Year: " + year); System.out.println("Month: " + month); System.out.println("Day: " + day); System.out.println("Hour: " + hour); System.out.println("Minute: " + minute); System.out.println("Second: " + second); System.out.println("Day of Week: " + dow); System.out.println("Day of Month: " + dom); System.out.println("Day of Year: " + doy); // 2、获取前月第一天和最后一天 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); String firstday, lastday; // 获取前月的第一天 cale = Calendar.getInstance(); cale.add(Calendar.MONTH, 0); cale.set(Calendar.DAY_OF_MONTH, 1); firstday = format.format(cale.getTime()); // 获取前月的最后一天 cale = Calendar.getInstance(); cale.add(Calendar.MONTH, 1); cale.set(Calendar.DAY_OF_MONTH, 0); lastday = format.format(cale.getTime()); System.out.println("前月第一天和最后一天分别是 : " + firstday + " and " + lastday); // 获取当前日期字符串 Date d = new Date(); System.out.println("当前日期字符串1:" + format.format(d)); System.out.println("当前日期字符串2:" + year + "/" + month + "/" + day + " " + hour + ":" + minute + ":" + second); //3、获取指定年月份的第一天和最后一天 int year = 2014; int month = 5; Calendar cal = Calendar.getInstance(); // 不加下面2行,就是取当前时间前一个月的第一天及最后一天 cal.set(Calendar.YEAR,year); cal.set(Calendar.MONTH, month); cal.set(Calendar.DAY_OF_MONTH, 1); cal.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = cal.getTime(); System.out.println(format.format(lastDate)); cal.set(Calendar.DAY_OF_MONTH, 1); Date firstDate = cal.getTime(); System.out.println(format.format(firstDate)); } }