Java 得到上个月第一天和最后一天

最新推荐文章于 2025-05-07 09:40:22 发布

惊鸿仙子君

最新推荐文章于 2025-05-07 09:40:22 发布

阅读量2.9k

点赞数

CC 4.0 BY-SA版权

分类专栏： java 文章标签： java string calendar

本文链接：https://blog.youkuaiyun.com/bp_fd_2011/article/details/6831027

java 专栏收录该内容

11 篇文章

订阅专栏

本文提供了一个Java方法来获取上个月的第一天和最后一天的日期。通过使用Calendar类，该方法能够准确地计算出指定月份的起始和结束日期，并以字符串形式返回。这对于需要进行时间范围查询或日期相关功能的应用非常有用。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

public static String lastMonFirstDay(){
		Calendar cal = Calendar.getInstance();
		int year = cal.get(Calendar.YEAR);
		int month = cal.get(Calendar.MONTH) + 1;
		cal.set(Calendar.DAY_OF_MONTH, 1);
		cal.add(Calendar.DAY_OF_MONTH, -1);
		int day = cal.get(Calendar.DAY_OF_MONTH);
		String months = "";
		String days = "";
		if (month > 1) {
			month--;
		} else {
			year--;
			month = 12;
		}
		if (!(String.valueOf(month).length() > 1)) {
			months = "0" + month;
		} else {
			months = String.valueOf(month);
		}
		if (!(String.valueOf(day).length() > 1)) {
			days = "0" + day;
		} else {
			days = String.valueOf(day);
		}
		String firstDay = "" + year + "-" + months + "-01";
		String[] lastMonth = new String[2];
		lastMonth[0] = firstDay;
		return firstDay;
	}
	
	public static String lastMonLastDay(){
		Calendar cal = Calendar.getInstance();
		int year = cal.get(Calendar.YEAR);
		int month = cal.get(Calendar.MONTH) + 1;
		cal.set(Calendar.DAY_OF_MONTH, 1);
		cal.add(Calendar.DAY_OF_MONTH, -1);
		int day = cal.get(Calendar.DAY_OF_MONTH);
		String months = "";
		String days = "";
		if (month > 1) {
			month--;
		} else {
			year--;
			month = 12;
		}
		if (!(String.valueOf(month).length() > 1)) {
			months = "0" + month;
		} else {
			months = String.valueOf(month);
		}
		if (!(String.valueOf(day).length() > 1)) {
			days = "0" + day;
		} else {
			days = String.valueOf(day);
		}
		String lastDay = "" + year + "-" + months + "-" + days;
		String[] lastMonth = new String[2];
		lastMonth[1] = lastDay;
		return lastDay;