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1 /*
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2 Copyright (c) 2008 Franklin Schmidt <fschmidt@gmail.com>
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3
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4 Permission is hereby granted, free of charge, to any person obtaining a copy
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5 of this software and associated documentation files (the "Software"), to deal
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6 in the Software without restriction, including without limitation the rights
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7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 copies of the Software, and to permit persons to whom the Software is
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9 furnished to do so, subject to the following conditions:
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10
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11 The above copyright notice and this permission notice shall be included in
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12 all copies or substantial portions of the Software.
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13
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14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 THE SOFTWARE.
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21 */
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22
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23 package fschmidt.util.java;
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24
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25 import java.util.Calendar;
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26 import java.util.Date;
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27
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28
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29 public class DateUtils {
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30 private DateUtils() {} // never
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31
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32 public static Date roundToDay(Date date) {
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33 Calendar cal = Calendar.getInstance();
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34 cal.setLenient(false);
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35 cal.setTime(date);
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36 Calendar cal2 = Calendar.getInstance();
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37 cal2.setLenient(false);
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38 cal2.clear();
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39 cal2.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONTH),cal.get(Calendar.DATE));
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40 return cal2.getTime();
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41 }
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42
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43 public static Date add(Date date,int days,int unit) {
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44 Calendar cal = Calendar.getInstance();
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45 cal.setLenient(false);
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46 cal.setTime(date);
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47 cal.add(unit,days);
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48 return cal.getTime();
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49 }
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50
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51 public static Date addDays(Date date,int days) {
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52 return add(date,days,Calendar.DATE);
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53 }
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54
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55 public static Date addHours(Date date,int hours) {
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56 return add(date,hours,Calendar.HOUR);
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57 }
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58
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59 private static final long millisPerHour = 1000L*60L*60L;
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60 private static final long millisPerDay = millisPerHour*24L;
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61
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62 public static int daysBetween(Date dateFrom,Date dateTo) {
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63 long from = dateFrom.getTime();
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64 long to = dateTo.getTime();
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65 long diff = (to - from)/millisPerDay;
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66 return (int)diff;
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67 }
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68
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69 public static int datesBetween(Date dateFrom,Date dateTo) {
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70 long from = roundToDay(dateFrom).getTime();
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71 long to = roundToDay(dateTo).getTime();
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72 long diff = (to - from + millisPerHour)/millisPerDay;
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73 return (int)diff;
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74 }
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75
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76 public static Date max(Date date1,Date date2) {
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77 return date1.after(date2) ? date1 : date2;
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78 }
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79
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80 public static Date min(Date date1,Date date2) {
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81 return date1.before(date2) ? date1 : date2;
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82 }
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83
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84 public static boolean equalToTheSecond(Date date1,Date date2) {
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85 return date1!=null && date2!=null && date1.getTime()/1000 == date2.getTime()/1000;
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86 }
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87
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88
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89 public static void main(String[] args) {
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90 Date today = roundToDay(new Date());
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91 Date date = today;
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92 for( int i=0; i<10; i++ ) {
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93 System.out.println(daysBetween(today,date));
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94 date = addDays(date,1);
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95 }
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96 }
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97 }
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