1 package ch.makery.address.util;
2
3 import java.text.ParseException;
4 import java.text.SimpleDateFormat;
5 import java.util.Calendar;
6
7 /**
8 * Helper functions for handling dates.
9 */
10 public class CalendarUtil {
11
12 /**
13 * Default date format in the form 2013-03-18.
14 */
15 private static final SimpleDateFormat DATE_FORMAT =
new SimpleDateFormat("yyyy-MM-dd"
);
16
17 /**
18 * Returns the given date as a well formatted string. The above defined date
19 * format is used.
20 *
21 * @param calendar date to be returned as a string
22 * @return formatted string
23 */
24 public static String format(Calendar calendar) {
25 if (calendar ==
null) {
26 return null;
27 }
28 return DATE_FORMAT.format(calendar.getTime());
29 }
30
31 /**
32 * Converts a String in the format "yyyy-MM-dd" to a Calendar object.
33 *
34 * Returns null if the String could not be converted.
35 *
36 * @param dateString the date as String
37 * @return the calendar object or null if it could not be converted
38 */
39 public static Calendar parse(String dateString) {
40 Calendar result =
Calendar.getInstance();
41 try {
42 result.setTime(DATE_FORMAT.parse(dateString));
43 return result;
44 }
catch (ParseException e) {
45 return null;
46 }
47 }
48
49 /**
50 * Checks the String whether it is a valid date.
51 *
52 * @param dateString
53 * @return true if the String is a valid date
54 */
55 public static boolean validString(String dateString) {
56 try {
57 DATE_FORMAT.parse(dateString);
58 return true;
59 }
catch (ParseException e) {
60 return false;
61 }
62 }
63 }
转载于:https://www.cnblogs.com/cuizhf/p/3248429.html
相关资源：CalendarUtil工具类
