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日期方法大全
/** * 得到当前的时间 字符串型 */ public static String getNowTime(){ Date time=new Date(); DateFormat format =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String today=format.format(time); return today; } /** * qbzuo 格式化日期 ：从Date ==>String * * @param date * @param style * such as "yyyy-MM-dd HH:mm:ss" "yyyy-MM-dd" * @return */ public static String formatDateWithStyle(Date date, String style) { try { SimpleDateFormat format = new SimpleDateFormat(style); return format.format(date); } catch (Exception e) { e.printStackTrace(); return null; } } /** * qbzuo 格式化日期 ：从Date ==>String * * @param date * @return */ public static String formatDateWithLongStyle(Date date) { try { SimpleDateFormat format = new SimpleDateFormat(DATE_STYLE_LONG); return format.format(date); } catch (Exception e) { e.printStackTrace(); return null; } } /** * qbzuo 格式化日期 ：从 String==>Date * * @param date * @return */ public static Date parseStringWithShortStyle(String datestr) { try { SimpleDateFormat format = new SimpleDateFormat(DATE_STYLE_SHORT); return format.parse(datestr); } catch (Exception e) { e.printStackTrace(); return null; } } /** * qbzuo 格式化日期 ：从 String==>Date * * @param date * @return */ public static Date parseStringWithLongStyle(String datestr) { try { SimpleDateFormat format = new SimpleDateFormat(DATE_STYLE_LONG); return format.parse(datestr); } catch (Exception e) { e.printStackTrace(); return null; } } /** * qbzuo 格式化日期 ：从Date ==>String * * @param date * @return */ public static String formatDateWithShortStyle(Date date) { try { SimpleDateFormat format = new SimpleDateFormat(DATE_STYLE_SHORT); return format.format(date); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 得到当前日期的几个月前日期 * * @return */ public static String getMonthBefore(int monthCount) { long oneDayValue = http://www.mamicode.com/24 * 60 * 60 * 1000; Calendar startDate = Calendar.getInstance(); // ========================================= Calendar start = Calendar.getInstance(); start.setTimeInMillis(startDate.getTimeInMillis() - (oneDayValue * 30 * monthCount)); String lastMonth = "" + start.get(Calendar.YEAR) + "-" + ((start.get(Calendar.MONTH) + 1) < 10 ? "0" + (start.get(Calendar.MONTH) + 1) : "" + (start.get(Calendar.MONTH) + 1)) + "-" + (start.get(Calendar.DATE) < 10 ? "0" + start.get(Calendar.DATE) : "" + start.get(Calendar.DATE)); return lastMonth; } /** * 得到指定时期的几天后的时间 */ public static String getDayAfter(Date date,int DayCount) { long oneDayValue = http://www.mamicode.com/24 * 60 * 60 * 1000; Calendar startDate = Calendar.getInstance(); startDate.setTime(date); // ========================================= Calendar start = Calendar.getInstance(); start.setTimeInMillis(startDate.getTimeInMillis() + (oneDayValue * DayCount)); String lastMonth = "" + start.get(Calendar.YEAR) + "-" + ((start.get(Calendar.MONTH) + 1) < 10 ? "0" + (start.get(Calendar.MONTH) + 1) : "" + (start.get(Calendar.MONTH) + 1)) + "-" + (start.get(Calendar.DATE) < 10 ? "0" + start.get(Calendar.DATE) : "" + start.get(Calendar.DATE)); return lastMonth; } /** * 得到指定时期的几天前的时间 */ public static String getDayBefore(Date date,int DayCount) { long oneDayValue = http://www.mamicode.com/24 * 60 * 60 * 1000; Calendar startDate = Calendar.getInstance(); startDate.setTime(date); // ========================================= Calendar start = Calendar.getInstance(); start.setTimeInMillis(startDate.getTimeInMillis() - (oneDayValue * DayCount)); String lastMonth = "" + start.get(Calendar.YEAR) + "-" + ((start.get(Calendar.MONTH) + 1) < 10 ? "0" + (start.get(Calendar.MONTH) + 1) : "" + (start.get(Calendar.MONTH) + 1)) + "-" + (start.get(Calendar.DATE) < 10 ? "0" + start.get(Calendar.DATE) : "" + start.get(Calendar.DATE)); return lastMonth; } /** * 得到当前日期的几个月后的日期 * * @return */ public static String getMonthAfter(int monthCount) { long oneDayValue = http://www.mamicode.com/24 * 60 * 60 * 1000; Calendar startDate = Calendar.getInstance(); // ========================================= Calendar start = Calendar.getInstance(); start.setTimeInMillis(startDate.getTimeInMillis() + (oneDayValue * 30 * monthCount)); String lastMonth = "" + start.get(Calendar.YEAR) + "-" + ((start.get(Calendar.MONTH) + 1) < 10 ? "0" + (start.get(Calendar.MONTH) + 1) : "" + (start.get(Calendar.MONTH) + 1)) + "-" + (start.get(Calendar.DATE) < 10 ? "0" + start.get(Calendar.DATE) : "" + start.get(Calendar.DATE)); return lastMonth; } //获得上周日的时间 如果今天是 周五 11月30号 这得到的时间是 11月25号 public static String getPreviousWeekSunday() { int weeks=0; weeks--; int mondayPlus = getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } //获得上周一的时间 public static String getPreviousWeekday() { int weeks=0; weeks--; int mondayPlus = getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } //获得本周一的时间 public static String getMondayOFWeek(){ int weeks = 0; int mondayPlus = getMondayPlus(); System.out.println("mondayPlus="+mondayPlus); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } //获得当前日期和上周日相差的天数 private static int getMondayPlus() { Calendar cd = Calendar.getInstance(); // 获得今天是一周的第几天，星期日是第一天，星期二是第二天...... int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1; //因为按中国礼拜一作为第一天所以这里减1 // System.out.println("dayOfWeek="+dayOfWeek); if (dayOfWeek == 0) { return -6; } else { return 1 - dayOfWeek; } } // 获得本周日的日期 如果今天是 周五 11月30号 这得到的时间是 12月2号 public static String getCurrentWeekday() { int weeks = 0; int mondayPlus = 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; } //获得当前日期是本月的第一天 public static String getFirstDayOfThisMonth() { Calendar cd=Calendar.getInstance(); int dayOfMonth=cd.get(Calendar.DAY_OF_MONTH); return getDayBefor(dayOfMonth-1); } //获得当前日期上月的第一天 public static String getFirstDayOfLastMonth() { Calendar cd=Calendar.getInstance(); int month=cd.get(Calendar.MONTH)+1; int year=cd.get(Calendar.YEAR); int lastMonth=1; int lastYear=2000; if (month==12) { lastMonth=1; lastYear=year-1; }else { lastMonth=month-1; lastYear=year; } return lastYear+"-"+(lastMonth<10?("0"+lastMonth):lastMonth)+"-01"; } //获得当前日期上月的最后一天 public static String getLastDayOfLastMonth() { Calendar cd=Calendar.getInstance(); int month=cd.get(Calendar.MONTH)+1; int year=cd.get(Calendar.YEAR); int lastMonth=1; int lastYear=2000; int lastDay=30; if (month==12) { lastMonth=1; lastYear=year-1; }else { lastMonth=month-1; lastYear=year; } if (lastMonth==2) { lastDay=28; }else if (lastMonth==4||lastMonth==6||lastMonth==9||lastMonth==11) { lastDay=30; }else { lastDay=31; } return lastYear+"-"+(lastMonth<10?("0"+lastMonth):lastMonth)+"-"+lastDay; } // 得到几天前的日期 public static String getDayBefor(int dateCount) { long oneDayValue = http://www.mamicode.com/24 * 60 * 60 * 1000; Calendar startDate = Calendar.getInstance(); // ========================================= Calendar start = Calendar.getInstance(); start.setTimeInMillis(startDate.getTimeInMillis() - (oneDayValue * dateCount)); String lastMonth = "" + start.get(Calendar.YEAR) + "-" + ((start.get(Calendar.MONTH) + 1) < 10 ? "0" + (start.get(Calendar.MONTH) + 1) : "" + (start.get(Calendar.MONTH) + 1)) + "-" + (start.get(Calendar.DATE) < 10 ? "0" + start.get(Calendar.DATE) : "" + start.get(Calendar.DATE)); return lastMonth; }
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