1. 程式人生 > >Android & Java DateUtils 拿來就用 包含常用的日期和時間轉換的工具

Android & Java DateUtils 拿來就用 包含常用的日期和時間轉換的工具

public class DateUtils2 {
    // private static String defaultDatePattern = "yyyy-MM-dd ";
    // private static String defaultDatePattern = "yyyyMMddHHmmssSSSZ";
    private static String defaultDatePattern = "yyyyMMddHHmmss";

    /**
     * 獲得預設的 date pattern
     */
    public static String getDatePattern
() { return defaultDatePattern; } /** * 返回預設Format的當前日期字串 */ public static String getToday() { Date today = new Date(); return format(today); } /** * 使用預設Format格式化Date成字串 */ public static String format(Date date) { return date == null
? " " : format(date, getDatePattern()); } /** * 使用引數Format格式化Date成字串 */ public static String format(Date date, String pattern) { return date == null ? " " : new SimpleDateFormat(pattern).format(date); } /** * 使用預設格式將字串轉為Date */ public static Date parse
(String strDate) throws ParseException { return StringUtils.isEmpty(strDate) ? null : parse(strDate, getDatePattern()); } /** * 使用引數Format將字串轉為Date */ public static Date parse(String strDate, String pattern) throws ParseException { return StringUtils.isEmpty(strDate) ? null : new SimpleDateFormat( pattern).parse(strDate); } /** * 在日期上增加數個整月 */ public static Date addMonth(Date date, int n) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.MONTH, n); return cal.getTime(); } public static String getLastDayOfMonth(String year, String month) { Calendar cal = Calendar.getInstance(); // 年 cal.set(Calendar.YEAR, Integer.parseInt(year)); // 月,因為Calendar裡的月是從0開始,所以要-1 // cal.set(Calendar.MONTH, Integer.parseInt(month) - 1); // 日,設為一號 cal.set(Calendar.DATE, 1); // 月份加一,得到下個月的一號 cal.add(Calendar.MONTH, 1); // 下一個月減一為本月最後一天 cal.add(Calendar.DATE, -1); return String.valueOf(cal.get(Calendar.DAY_OF_MONTH));// 獲得月末是幾號 } public static Date getDate(String year, String month, String day) throws ParseException { String result = year + "- " + (month.length() == 1 ? ("0 " + month) : month) + "- " + (day.length() == 1 ? ("0 " + day) : day); return parse(result); } // 獲取當天的開始時間 public static java.util.Date getDayBegin() { Calendar cal = new GregorianCalendar(); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); cal.set(Calendar.MILLISECOND, 0); return cal.getTime(); } // 獲取當天的結束時間 public static java.util.Date getDayEnd() { Calendar cal = new GregorianCalendar(); cal.set(Calendar.HOUR_OF_DAY, 23); cal.set(Calendar.MINUTE, 59); cal.set(Calendar.SECOND, 59); return cal.getTime(); } // 獲取昨天的開始時間 public static Date getBeginDayOfYesterday() { Calendar cal = new GregorianCalendar(); cal.setTime(getDayBegin()); cal.add(Calendar.DAY_OF_MONTH, -1); return cal.getTime(); } // 獲取昨天的結束時間 public static Date getEndDayOfYesterDay() { Calendar cal = new GregorianCalendar(); cal.setTime(getDayEnd()); cal.add(Calendar.DAY_OF_MONTH, -1); return cal.getTime(); } // 獲取明天的開始時間 public static Date getBeginDayOfTomorrow() { Calendar cal = new GregorianCalendar(); cal.setTime(getDayBegin()); cal.add(Calendar.DAY_OF_MONTH, 1); return cal.getTime(); } // 獲取明天的結束時間 public static Date getEndDayOfTomorrow() { Calendar cal = new GregorianCalendar(); cal.setTime(getDayEnd()); cal.add(Calendar.DAY_OF_MONTH, 1); return cal.getTime(); } // 獲取本週的開始時間 public static Date getBeginDayOfWeek() { Date date = new Date(); Calendar cal = Calendar.getInstance(); cal.setTime(date); int dayofweek = cal.get(Calendar.DAY_OF_WEEK); if (dayofweek == 1) { dayofweek += 7; } cal.add(Calendar.DATE, 2 - dayofweek); return getDayStartTime(cal.getTime()); } // 獲取本週的結束時間 public static Date getEndDayOfWeek() { Calendar cal = Calendar.getInstance(); cal.setTime(getBeginDayOfWeek()); cal.add(Calendar.DAY_OF_WEEK, 6); Date weekEndSta = cal.getTime(); return getDayEndTime(weekEndSta); } // 獲取本月的開始時間 public static Date getBeginDayOfMonth() { Calendar calendar = Calendar.getInstance(); calendar.set(getNowYear(), getNowMonth() - 1, 1); return getDayStartTime(calendar.getTime()); } // 獲取本月的結束時間 public static Date getEndDayOfMonth() { Calendar calendar = Calendar.getInstance(); calendar.set(getNowYear(), getNowMonth() - 1, 1); int day = calendar.getActualMaximum(5); calendar.set(getNowYear(), getNowMonth() - 1, day); return getDayEndTime(calendar.getTime()); } // 獲取本年的開始時間 public static java.util.Date getBeginDayOfYear() { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, getNowYear()); // cal.set cal.set(Calendar.MONTH, Calendar.JANUARY); cal.set(Calendar.DATE, 1); return getDayStartTime(cal.getTime()); } // 獲取本年的結束時間 public static java.util.Date getEndDayOfYear() { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, getNowYear()); cal.set(Calendar.MONTH, Calendar.DECEMBER); cal.set(Calendar.DATE, 31); return getDayEndTime(cal.getTime()); } // 獲取某個日期的開始時間 public static Timestamp getDayStartTime(Date d) { Calendar calendar = Calendar.getInstance(); if (null != d) calendar.setTime(d); calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0); calendar.set(Calendar.MILLISECOND, 0); return new Timestamp(calendar.getTimeInMillis()); } // 獲取某個日期的結束時間 public static Timestamp getDayEndTime(Date d) { Calendar calendar = Calendar.getInstance(); if (null != d) calendar.setTime(d); calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23, 59, 59); calendar.set(Calendar.MILLISECOND, 999); return new Timestamp(calendar.getTimeInMillis()); } // 獲取今年是哪一年 public static Integer getNowYear() { Date date = new Date(); GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance(); gc.setTime(date); return Integer.valueOf(gc.get(1)); } // 獲取本月是哪一月 public static int getNowMonth() { Date date = new Date(); GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance(); gc.setTime(date); return gc.get(2) + 1; } // 兩個日期相減得到的天數 public static int getDiffDays(Date beginDate, Date endDate) { if (beginDate == null || endDate == null) { throw new IllegalArgumentException("getDiffDays param is null!"); } long diff = (endDate.getTime() - beginDate.getTime()) / (1000 * 60 * 60 * 24); int days = new Long(diff).intValue(); return days; } // 兩個日期相減得到的毫秒數 public static long dateDiff(Date beginDate, Date endDate) { long date1ms = beginDate.getTime(); long date2ms = endDate.getTime(); return date2ms - date1ms; } // 獲取兩個日期中的最大日期 public static Date max(Date beginDate, Date endDate) { if (beginDate == null) { return endDate; } if (endDate == null) { return beginDate; } if (beginDate.after(endDate)) { return beginDate; } return endDate; } // 獲取兩個日期中的最小日期 public static Date min(Date beginDate, Date endDate) { if (beginDate == null) { return endDate; } if (endDate == null) { return beginDate; } if (beginDate.after(endDate)) { return endDate; } return beginDate; } // 返回某月該季度的第一個月 public static Date getFirstSeasonDate(Date date) { final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 }; Calendar cal = Calendar.getInstance(); cal.setTime(date); int sean = SEASON[cal.get(Calendar.MONTH)]; cal.set(Calendar.MONTH, sean * 3 - 3); return cal.getTime(); } // 返回某個日期下幾天的日期 public static Date getNextDay(Date date, int i) { Calendar cal = new GregorianCalendar(); cal.setTime(date); cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i); return cal.getTime(); } // 返回某個日期前幾天的日期 public static Date getFrontDay(Date date, int i) { Calendar cal = new GregorianCalendar(); cal.setTime(date); cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i); return cal.getTime(); } // 獲取某年某月到某年某月按天的切片日期集合(間隔天數的集合) public static List getTimeList(int beginYear, int beginMonth, int endYear, int endMonth, int k) { List list = new ArrayList(); if (beginYear == endYear) { for (int j = beginMonth; j <= endMonth; j++) { list.add(getTimeList(beginYear, j, k)); } } else { { for (int j = beginMonth; j < 12; j++) { list.add(getTimeList(beginYear, j, k)); } for (int i = beginYear + 1; i < endYear; i++) { for (int j = 0; j < 12; j++) { list.add(getTimeList(i, j, k)); } } for (int j = 0; j <= endMonth; j++) { list.add(getTimeList(endYear, j, k)); } } } return list; } // 獲取某年某月按天切片日期集合(某個月間隔多少天的日期集合) public static List getTimeList(int beginYear, int beginMonth, int k) { List list = new ArrayList(); Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1); int max = begincal.getActualMaximum(Calendar.DATE); for (int i = 1; i < max; i = i + k) { list.add(begincal.getTime()); begincal.add(Calendar.DATE, k); } begincal = new GregorianCalendar(beginYear, beginMonth, max); list.add(begincal.getTime()); return list; } /** * 根據提供的年月日獲取該月份的第一天 * @Description: (這裡用一句話描述這個方法的作用) * @Author: gyz * @Since: 2017-1-9下午2:26:57 * @param year * @param monthOfYear * @return */ public static Date getSupportBeginDayofMonth(int year, int monthOfYear) { Calendar cal = Calendar.getInstance(); // 不加下面2行,就是取當前時間前一個月的第一天及最後一天 cal.set(Calendar.YEAR, year); cal.set(Calendar.MONTH, monthOfYear); cal.set(Calendar.DAY_OF_MONTH, 1); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); cal.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = cal.getTime(); cal.set(Calendar.DAY_OF_MONTH, 1); Date firstDate = cal.getTime(); return firstDate; } /** * 根據提供的年月獲取該月份的最後一天 * @Description: (這裡用一句話描述這個方法的作用) * @Author: gyz * @Since: 2017-1-9下午2:29:38 * @param year * @param monthOfYear * @return */ public static Date getSupportEndDayofMonth(int year, int monthOfYear) { Calendar cal = Calendar.getInstance(); // 不加下面2行,就是取當前時間前一個月的第一天及最後一天 cal.set(Calendar.YEAR, year); cal.set(Calendar.MONTH, monthOfYear); cal.set(Calendar.DAY_OF_MONTH, 1); cal.set(Calendar.HOUR_OF_DAY, 23); cal.set(Calendar.MINUTE, 59); cal.set(Calendar.SECOND, 59); cal.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = cal.getTime(); cal.set(Calendar.DAY_OF_MONTH, 1); Date firstDate = cal.getTime(); return lastDate; } }