1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.contacts.util; 18 19 import android.content.Context; 20 import android.text.format.DateFormat; 21 22 import java.text.ParsePosition; 23 import java.text.SimpleDateFormat; 24 import java.util.Date; 25 import java.util.Locale; 26 import java.util.TimeZone; 27 28 /** 29 * Utility methods for processing dates. 30 */ 31 public class DateUtils { 32 public static final TimeZone UTC_TIMEZONE = TimeZone.getTimeZone("UTC"); 33 34 // All the SimpleDateFormats in this class use the UTC timezone 35 public static final SimpleDateFormat NO_YEAR_DATE_FORMAT = 36 new SimpleDateFormat("--MM-dd", Locale.US); 37 public static final SimpleDateFormat FULL_DATE_FORMAT = 38 new SimpleDateFormat("yyyy-MM-dd", Locale.US); 39 public static final SimpleDateFormat DATE_AND_TIME_FORMAT = 40 new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US); 41 public static final SimpleDateFormat NO_YEAR_DATE_AND_TIME_FORMAT = 42 new SimpleDateFormat("--MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US); 43 44 // Variations of ISO 8601 date format. Do not change the order - it does affect the 45 // result in ambiguous cases. 46 private static final SimpleDateFormat[] DATE_FORMATS = { 47 FULL_DATE_FORMAT, 48 DATE_AND_TIME_FORMAT, 49 new SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'", Locale.US), 50 new SimpleDateFormat("yyyyMMdd", Locale.US), 51 new SimpleDateFormat("yyyyMMdd'T'HHmmssSSS'Z'", Locale.US), 52 new SimpleDateFormat("yyyyMMdd'T'HHmmss'Z'", Locale.US), 53 new SimpleDateFormat("yyyyMMdd'T'HHmm'Z'", Locale.US), 54 }; 55 56 private static final java.text.DateFormat FORMAT_WITHOUT_YEAR_MONTH_FIRST = 57 new SimpleDateFormat("MMMM dd"); 58 59 private static final java.text.DateFormat FORMAT_WITHOUT_YEAR_DAY_FIRST = 60 new SimpleDateFormat("dd MMMM"); 61 62 static { 63 for (SimpleDateFormat format : DATE_FORMATS) { 64 format.setLenient(true); 65 format.setTimeZone(UTC_TIMEZONE); 66 } 67 NO_YEAR_DATE_FORMAT.setTimeZone(UTC_TIMEZONE); 68 FORMAT_WITHOUT_YEAR_MONTH_FIRST.setTimeZone(UTC_TIMEZONE); 69 FORMAT_WITHOUT_YEAR_DAY_FIRST.setTimeZone(UTC_TIMEZONE); 70 } 71 72 /** 73 * Parses the supplied string to see if it looks like a date. If so, 74 * returns the date. Otherwise, returns null. 75 */ 76 public static Date parseDate(String string) { 77 ParsePosition parsePosition = new ParsePosition(0); 78 for (int i = 0; i < DATE_FORMATS.length; i++) { 79 SimpleDateFormat f = DATE_FORMATS[i]; 80 synchronized (f) { 81 parsePosition.setIndex(0); 82 Date date = f.parse(string, parsePosition); 83 if (parsePosition.getIndex() == string.length()) { 84 return date; 85 } 86 } 87 } 88 return null; 89 } 90 91 /** 92 * Parses the supplied string to see if it looks like a date. If so, 93 * returns the same date in a cleaned-up format for the user. Otherwise, returns 94 * the supplied string unchanged. 95 */ 96 public static String formatDate(Context context, String string) { 97 if (string == null) { 98 return null; 99 } 100 101 string = string.trim(); 102 if (string.length() == 0) { 103 return string; 104 } 105 106 ParsePosition parsePosition = new ParsePosition(0); 107 108 Date date; 109 110 synchronized (NO_YEAR_DATE_FORMAT) { 111 date = NO_YEAR_DATE_FORMAT.parse(string, parsePosition); 112 } 113 114 if (parsePosition.getIndex() == string.length()) { 115 java.text.DateFormat outFormat = isMonthBeforeDay(context) 116 ? FORMAT_WITHOUT_YEAR_MONTH_FIRST 117 : FORMAT_WITHOUT_YEAR_DAY_FIRST; 118 synchronized (outFormat) { 119 return outFormat.format(date); 120 } 121 } 122 123 for (int i = 0; i < DATE_FORMATS.length; i++) { 124 SimpleDateFormat f = DATE_FORMATS[i]; 125 synchronized (f) { 126 parsePosition.setIndex(0); 127 date = f.parse(string, parsePosition); 128 if (parsePosition.getIndex() == string.length()) { 129 java.text.DateFormat outFormat = DateFormat.getDateFormat(context); 130 outFormat.setTimeZone(UTC_TIMEZONE); 131 return outFormat.format(date); 132 } 133 } 134 } 135 return string; 136 } 137 138 public static boolean isMonthBeforeDay(Context context) { 139 char[] dateFormatOrder = DateFormat.getDateFormatOrder(context); 140 for (int i = 0; i < dateFormatOrder.length; i++) { 141 if (dateFormatOrder[i] == DateFormat.DATE) { 142 return false; 143 } 144 if (dateFormatOrder[i] == DateFormat.MONTH) { 145 return true; 146 } 147 } 148 return false; 149 } 150 } 151
