java 获取当前年份 月份,当月第一天和最后一天
获取当前年份 月份,当月第一天和最后一天,工作中会经常用到,下面是代码:
package basic.day01; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class DateTest { public static void main(String[] args) { // 获取当前年份、月份、日期 Calendar cal = Calendar.getInstance(); int year = cal.get(Calendar.YEAR); int month = cal.get(Calendar.MONTH) + 1; int day = cal.get(Calendar.DATE); int hour = cal.get(Calendar.HOUR_OF_DAY); int minute = cal.get(Calendar.MINUTE); int second = cal.get(Calendar.SECOND); int dow = cal.get(Calendar.DAY_OF_WEEK); int dom = cal.get(Calendar.DAY_OF_MONTH); int doy = cal.get(Calendar.DAY_OF_YEAR); System.out.println("Current Date: " + cal.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); //当前季度 (当前月转换季度) String quarter = ""; int m = cal.get(Calendar.MONTH) + 1; if (m >= 1 && m <= 3) { quarter = "1"; } else if (m >= 4 && m <= 6) { quarter = "2"; } else if (m >= 7 && m <= 9) { quarter = "3"; } else { quarter = "4"; } System.out.println("Quarter: " + quarter); SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd"); SimpleDateFormat format2 = new SimpleDateFormat("yyyy/MM/dd HH:mm"); SimpleDateFormat format3 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); // 获取当前日期字符串 Date d = new Date(); System.out.println("当前日期字符串1:" + format1.format(d)); System.out.println("当前日期字符串2:" + format2.format(d)); System.out.println("当前日期字符串3:" + format3.format(d)); //拼装日期字符串 System.out.println("当前日期字符串4:" + year + "/" + month + "/" + day + " " + hour + ":" + minute + ":" + second); } }
good luck!