001// License: GPL. For details, see LICENSE file. 002package org.openstreetmap.josm.tools.date; 003 004import java.text.DateFormat; 005import java.text.ParsePosition; 006import java.text.SimpleDateFormat; 007import java.time.Instant; 008import java.time.ZoneId; 009import java.time.ZoneOffset; 010import java.time.ZonedDateTime; 011import java.time.format.DateTimeFormatter; 012import java.util.Date; 013import java.util.Locale; 014import java.util.TimeZone; 015import java.util.concurrent.TimeUnit; 016 017import javax.xml.datatype.DatatypeConfigurationException; 018import javax.xml.datatype.DatatypeFactory; 019 020import org.openstreetmap.josm.data.preferences.BooleanProperty; 021import org.openstreetmap.josm.tools.CheckParameterUtil; 022import org.openstreetmap.josm.tools.Logging; 023import org.openstreetmap.josm.tools.UncheckedParseException; 024 025/** 026 * A static utility class dealing with: 027 * <ul> 028 * <li>parsing XML date quickly and formatting a date to the XML UTC format regardless of current locale</li> 029 * <li>providing a single entry point for formatting dates to be displayed in JOSM GUI, based on user preferences</li> 030 * </ul> 031 * @author nenik 032 */ 033public final class DateUtils { 034 035 /** 036 * The UTC time zone. 037 */ 038 public static final TimeZone UTC = TimeZone.getTimeZone("UTC"); 039 040 /** 041 * Property to enable display of ISO dates globally. 042 * @since 7299 043 */ 044 public static final BooleanProperty PROP_ISO_DATES = new BooleanProperty("iso.dates", false); 045 046 private static final DatatypeFactory XML_DATE; 047 048 static { 049 DatatypeFactory fact = null; 050 try { 051 fact = DatatypeFactory.newInstance(); 052 } catch (DatatypeConfigurationException e) { 053 Logging.error(e); 054 } 055 XML_DATE = fact; 056 } 057 058 /** 059 * Constructs a new {@code DateUtils}. 060 */ 061 private DateUtils() { 062 // Hide default constructor for utils classes 063 } 064 065 /** 066 * Parses XML date quickly, regardless of current locale. 067 * @param str The XML date as string 068 * @return The date 069 * @throws UncheckedParseException if the date does not match any of the supported date formats 070 */ 071 public static synchronized Date fromString(String str) { 072 return new Date(tsFromString(str)); 073 } 074 075 /** 076 * Parses XML date quickly, regardless of current locale. 077 * @param str The XML date as string 078 * @return The date in milliseconds since epoch 079 * @throws UncheckedParseException if the date does not match any of the supported date formats 080 */ 081 public static synchronized long tsFromString(String str) { 082 // "2007-07-25T09:26:24{Z|{+|-}01[:00]}" 083 if (checkLayout(str, "xxxx-xx-xxTxx:xx:xxZ") || 084 checkLayout(str, "xxxx-xx-xxTxx:xx:xx") || 085 checkLayout(str, "xxxx:xx:xx xx:xx:xx") || 086 checkLayout(str, "xxxx-xx-xx xx:xx:xxZ") || 087 checkLayout(str, "xxxx-xx-xx xx:xx:xx UTC") || 088 checkLayout(str, "xxxx-xx-xxTxx:xx:xx+xx") || 089 checkLayout(str, "xxxx-xx-xxTxx:xx:xx-xx") || 090 checkLayout(str, "xxxx-xx-xxTxx:xx:xx+xx:00") || 091 checkLayout(str, "xxxx-xx-xxTxx:xx:xx-xx:00")) { 092 final ZonedDateTime local = ZonedDateTime.of( 093 parsePart4(str, 0), 094 parsePart2(str, 5), 095 parsePart2(str, 8), 096 parsePart2(str, 11), 097 parsePart2(str, 14), 098 parsePart2(str, 17), 099 0, 100 // consider EXIF date in default timezone 101 checkLayout(str, "xxxx:xx:xx xx:xx:xx") ? ZoneId.systemDefault() : ZoneOffset.UTC 102 ); 103 if (str.length() == 22 || str.length() == 25) { 104 final int plusHr = parsePart2(str, 20); 105 final long mul = str.charAt(19) == '+' ? -1 : 1; 106 return local.plusHours(plusHr * mul).toInstant().toEpochMilli(); 107 } 108 return local.toInstant().toEpochMilli(); 109 } else if (checkLayout(str, "xxxx-xx-xxTxx:xx:xx.xxxZ") || 110 checkLayout(str, "xxxx-xx-xxTxx:xx:xx.xxx") || 111 checkLayout(str, "xxxx:xx:xx xx:xx:xx.xxx") || 112 checkLayout(str, "xxxx-xx-xxTxx:xx:xx.xxx+xx:00") || 113 checkLayout(str, "xxxx-xx-xxTxx:xx:xx.xxx-xx:00")) { 114 final ZonedDateTime local = ZonedDateTime.of( 115 parsePart4(str, 0), 116 parsePart2(str, 5), 117 parsePart2(str, 8), 118 parsePart2(str, 11), 119 parsePart2(str, 14), 120 parsePart2(str, 17), 121 parsePart3(str, 20) * 1_000_000, 122 // consider EXIF date in default timezone 123 checkLayout(str, "xxxx:xx:xx xx:xx:xx.xxx") ? ZoneId.systemDefault() : ZoneOffset.UTC 124 ); 125 if (str.length() == 29) { 126 final int plusHr = parsePart2(str, 24); 127 final long mul = str.charAt(23) == '+' ? -1 : 1; 128 return local.plusHours(plusHr * mul).toInstant().toEpochMilli(); 129 } 130 return local.toInstant().toEpochMilli(); 131 } else { 132 // example date format "18-AUG-08 13:33:03" 133 SimpleDateFormat f = new SimpleDateFormat("dd-MMM-yy HH:mm:ss"); 134 Date d = f.parse(str, new ParsePosition(0)); 135 if (d != null) 136 return d.getTime(); 137 } 138 139 try { 140 return XML_DATE.newXMLGregorianCalendar(str).toGregorianCalendar().getTimeInMillis(); 141 } catch (IllegalArgumentException ex) { 142 throw new UncheckedParseException("The date string (" + str + ") could not be parsed.", ex); 143 } 144 } 145 146 /** 147 * Formats a date to the XML UTC format regardless of current locale. 148 * @param timestamp number of seconds since the epoch 149 * @return The formatted date 150 */ 151 public static synchronized String fromTimestamp(int timestamp) { 152 final ZonedDateTime temporal = Instant.ofEpochMilli(TimeUnit.SECONDS.toMillis(timestamp)).atZone(ZoneOffset.UTC); 153 return DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(temporal); 154 } 155 156 /** 157 * Formats a date to the XML UTC format regardless of current locale. 158 * @param date The date to format 159 * @return The formatted date 160 */ 161 public static synchronized String fromDate(Date date) { 162 final ZonedDateTime temporal = date.toInstant().atZone(ZoneOffset.UTC); 163 return DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(temporal); 164 } 165 166 /** 167 * Null-safe date cloning method. 168 * @param d date to clone, or null 169 * @return cloned date, or null 170 * @since 11878 171 */ 172 public static Date cloneDate(Date d) { 173 return d != null ? (Date) d.clone() : null; 174 } 175 176 private static boolean checkLayout(String text, String pattern) { 177 if (text.length() != pattern.length()) 178 return false; 179 for (int i = 0; i < pattern.length(); i++) { 180 char pc = pattern.charAt(i); 181 char tc = text.charAt(i); 182 if (pc == 'x' && Character.isDigit(tc)) 183 continue; 184 else if (pc == 'x' || pc != tc) 185 return false; 186 } 187 return true; 188 } 189 190 private static int num(char c) { 191 return c - '0'; 192 } 193 194 private static int parsePart2(String str, int off) { 195 return 10 * num(str.charAt(off)) + num(str.charAt(off + 1)); 196 } 197 198 private static int parsePart3(String str, int off) { 199 return 100 * num(str.charAt(off)) + 10 * num(str.charAt(off + 1)) + num(str.charAt(off + 2)); 200 } 201 202 private static int parsePart4(String str, int off) { 203 return 1000 * num(str.charAt(off)) + 100 * num(str.charAt(off + 1)) + 10 * num(str.charAt(off + 2)) + num(str.charAt(off + 3)); 204 } 205 206 /** 207 * Returns a new {@code SimpleDateFormat} for date only, according to <a href="https://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a>. 208 * @return a new ISO 8601 date format, for date only. 209 * @since 7299 210 */ 211 public static SimpleDateFormat newIsoDateFormat() { 212 return new SimpleDateFormat("yyyy-MM-dd"); 213 } 214 215 /** 216 * Returns a new {@code SimpleDateFormat} for date and time, according to <a href="https://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a>. 217 * @return a new ISO 8601 date format, for date and time. 218 * @since 7299 219 */ 220 public static SimpleDateFormat newIsoDateTimeFormat() { 221 return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX"); 222 } 223 224 /** 225 * Returns a new {@code SimpleDateFormat} for date and time, according to format used in OSM API errors. 226 * @return a new date format, for date and time, to use for OSM API error handling. 227 * @since 7299 228 */ 229 public static SimpleDateFormat newOsmApiDateTimeFormat() { 230 // Example: "2010-09-07 14:39:41 UTC". 231 // Always parsed with US locale regardless of the current locale in JOSM 232 return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z", Locale.US); 233 } 234 235 /** 236 * Returns the date format to be used for current user, based on user preferences. 237 * @param dateStyle The date style as described in {@link DateFormat#getDateInstance}. Ignored if "ISO dates" option is set 238 * @return The date format 239 * @since 7299 240 */ 241 public static DateFormat getDateFormat(int dateStyle) { 242 if (PROP_ISO_DATES.get()) { 243 return newIsoDateFormat(); 244 } else { 245 return DateFormat.getDateInstance(dateStyle, Locale.getDefault()); 246 } 247 } 248 249 /** 250 * Formats a date to be displayed to current user, based on user preferences. 251 * @param date The date to display. Must not be {@code null} 252 * @param dateStyle The date style as described in {@link DateFormat#getDateInstance}. Ignored if "ISO dates" option is set 253 * @return The formatted date 254 * @since 7299 255 */ 256 public static String formatDate(Date date, int dateStyle) { 257 CheckParameterUtil.ensureParameterNotNull(date, "date"); 258 return getDateFormat(dateStyle).format(date); 259 } 260 261 /** 262 * Returns the time format to be used for current user, based on user preferences. 263 * @param timeStyle The time style as described in {@link DateFormat#getTimeInstance}. Ignored if "ISO dates" option is set 264 * @return The time format 265 * @since 7299 266 */ 267 public static DateFormat getTimeFormat(int timeStyle) { 268 if (PROP_ISO_DATES.get()) { 269 // This is not strictly conform to ISO 8601. We just want to avoid US-style times such as 3.30pm 270 return new SimpleDateFormat("HH:mm:ss"); 271 } else { 272 return DateFormat.getTimeInstance(timeStyle, Locale.getDefault()); 273 } 274 } 275 276 /** 277 * Formats a time to be displayed to current user, based on user preferences. 278 * @param time The time to display. Must not be {@code null} 279 * @param timeStyle The time style as described in {@link DateFormat#getTimeInstance}. Ignored if "ISO dates" option is set 280 * @return The formatted time 281 * @since 7299 282 */ 283 public static String formatTime(Date time, int timeStyle) { 284 CheckParameterUtil.ensureParameterNotNull(time, "time"); 285 return getTimeFormat(timeStyle).format(time); 286 } 287 288 /** 289 * Returns the date/time format to be used for current user, based on user preferences. 290 * @param dateStyle The date style as described in {@link DateFormat#getDateTimeInstance}. Ignored if "ISO dates" option is set 291 * @param timeStyle The time style as described in {@code DateFormat.getDateTimeInstance}. Ignored if "ISO dates" option is set 292 * @return The date/time format 293 * @since 7299 294 */ 295 public static DateFormat getDateTimeFormat(int dateStyle, int timeStyle) { 296 if (PROP_ISO_DATES.get()) { 297 // This is not strictly conform to ISO 8601. We just want to avoid US-style times such as 3.30pm 298 // and we don't want to use the 'T' separator as a space character is much more readable 299 return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 300 } else { 301 return DateFormat.getDateTimeInstance(dateStyle, timeStyle, Locale.getDefault()); 302 } 303 } 304 305 /** 306 * Formats a date/time to be displayed to current user, based on user preferences. 307 * @param datetime The date/time to display. Must not be {@code null} 308 * @param dateStyle The date style as described in {@link DateFormat#getDateTimeInstance}. Ignored if "ISO dates" option is set 309 * @param timeStyle The time style as described in {@code DateFormat.getDateTimeInstance}. Ignored if "ISO dates" option is set 310 * @return The formatted date/time 311 * @since 7299 312 */ 313 public static String formatDateTime(Date datetime, int dateStyle, int timeStyle) { 314 CheckParameterUtil.ensureParameterNotNull(datetime, "datetime"); 315 return getDateTimeFormat(dateStyle, timeStyle).format(datetime); 316 } 317}