package com.hefeng.test; import java.text.DateFormat; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; public class TimeTest { //用来全局控制 上一周，本周，下一周的周数变化 private int weeks = 0; private int MaxDate;//一月最大天数 private int MaxYear;//一年最大天数 public static void main(String[] args) { TimeTest tt = new TimeTest(); System.out.println("获取当天日期:"+tt.getNowTime("yyyy-MM-dd")); System.out.println("获取本周一日期:"+tt.getMondayOFWeek()); System.out.println("获取本周日的日期~:"+tt.getCurrentWeekday()); System.out.println("获取上周一日期:"+tt.getPreviousWeekday()); System.out.println("获取上周日日期:"+tt.getPreviousWeekSunday()); System.out.println("获取下周一日期:"+tt.getNextMonday()); System.out.println("获取下周日日期:"+tt.getNextSunday()); System.out.println("获得相应周的周六的日期:"+tt.getNowTime("yyyy-MM-dd")); System.out.println("获取本月第一天日期:"+tt.getFirstDayOfMonth()); System.out.println("获取本月最后一天日期:"+tt.getDefaultDay()); System.out.println("获取上月第一天日期:"+tt.getPreviousMonthFirst()); System.out.println("获取上月最后一天的日期:"+tt.getPreviousMonthEnd()); System.out.println("获取下月第一天日期:"+tt.getNextMonthFirst()); System.out.println("获取下月最后一天日期:"+tt.getNextMonthEnd()); System.out.println("获取本年的第一天日期:"+tt.getCurrentYearFirst()); System.out.println("获取本年最后一天日期:"+tt.getCurrentYearEnd()); System.out.println("获取去年的第一天日期:"+tt.getPreviousYearFirst()); System.out.println("获取去年的最后一天日期:"+tt.getPreviousYearEnd()); System.out.println("获取明年第一天日期:"+tt.getNextYearFirst()); System.out.println("获取明年最后一天日期:"+tt.getNextYearEnd()); System.out.println("获取本季度第一天到最后一天:"+tt.getThisSeasonTime(11)); System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"+TimeTest.getTwoDay("2008-12-1","2008-9-29")); } public static String getTwoDay(String sj1, String sj2) { SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); long day = 0; try { java.util.Date date = myFormatter.parse(sj1); java.util.Date mydate = myFormatter.parse(sj2); day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); } catch (Exception e) { return ""; } return day + ""; } public static String getWeek(String sdate) { // 再转换为时间 Date date = TimeTest.strToDate(sdate); Calendar c = Calendar.getInstance(); c.setTime(date); // int hour=c.get(Calendar.DAY_OF_WEEK); // hour中存的就是星期几了，其范围 1~7 // 1=星期日 7=星期六，其他类推 return new SimpleDateFormat("EEEE").format(c.getTime()); } public static Date strToDate(String strDate) { SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(strDate, pos); return strtodate; } public static long getDays(String date1, String date2) { if (date1 == null || date1.equals("")) return 0; if (date2 == null || date2.equals("")) return 0; // 转换为标准时间 SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date date = null; java.util.Date mydate = null; try { date = myFormatter.parse(date1); mydate = myFormatter.parse(date2); } catch (Exception e) { } long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); return day; } // 计算当月最后一天,返回字符串 public String getDefaultDay(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1号 lastDate.add(Calendar.MONTH,1);//加一个月，变为下月的1号 lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天 str=sdf.format(lastDate.getTime()); return str; } // 上月第一天 public String getPreviousMonthFirst(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1号 lastDate.add(Calendar.MONTH,-1);//减一个月，变为下月的1号 //lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天 str=sdf.format(lastDate.getTime()); return str; } //获取当月第一天 public String getFirstDayOfMonth(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1号 str=sdf.format(lastDate.getTime()); return str; } // 获得本周星期日的日期 public String getCurrentWeekday() { weeks = 0; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus+6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } |