/* * Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * (C) Copyright Taligent, Inc. 1996 - All Rights Reserved * (C) Copyright IBM Corp. 1996 - All Rights Reserved * * The original version of this source code and documentation is copyrighted * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These * materials are provided under terms of a License Agreement between Taligent * and Sun. This technology is protected by multiple US and International * patents. This notice and attribution to Taligent may not be removed. * Taligent is a registered trademark of Taligent, Inc. * */ package java.util; import java.io.Serializable; import java.lang.ref.SoftReference; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.concurrent.ConcurrentHashMap; import sun.misc.SharedSecrets; import sun.misc.JavaAWTAccess; import sun.security.action.GetPropertyAction; import sun.util.locale.provider.TimeZoneNameUtility; import sun.util.calendar.ZoneInfo; import sun.util.calendar.ZoneInfoFile; /** * TimeZone represents a time zone offset, and also figures out daylight * savings. * *

* Typically, you get a TimeZone using getDefault * which creates a TimeZone based on the time zone where the program * is running. For example, for a program running in Japan, getDefault * creates a TimeZone object based on Japanese Standard Time. * *

* You can also get a TimeZone using getTimeZone * along with a time zone ID. For instance, the time zone ID for the * U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a * U.S. Pacific Time TimeZone object with: * 

 * TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles");
 *
* You can use the getAvailableIDs method to iterate through * all the supported time zone IDs. You can then choose a * supported ID to get a TimeZone. * If the time zone you want is not represented by one of the * supported IDs, then a custom time zone ID can be specified to * produce a TimeZone. The syntax of a custom time zone ID is: * * 
 * CustomID:
 *         GMT Sign Hours : Minutes
 *         GMT Sign Hours Minutes
 *         GMT Sign Hours
 * Sign: one of
 *         + -
 * Hours:
 *         Digit
 *         Digit Digit
 * Minutes:
 *         Digit Digit
 * Digit: one of
 *         0 1 2 3 4 5 6 7 8 9
 *
* * Hours must be between 0 to 23 and Minutes must be * between 00 to 59. For example, "GMT+10" and "GMT+0010" mean ten * hours and ten minutes ahead of GMT, respectively. *

* The format is locale independent and digits must be taken from the * Basic Latin block of the Unicode standard. No daylight saving time * transition schedule can be specified with a custom time zone ID. If * the specified string doesn't match the syntax, "GMT" * is used. *

* When creating a TimeZone, the specified custom time * zone ID is normalized in the following syntax: * 

 * NormalizedCustomID:
 *         GMT Sign TwoDigitHours : Minutes
 * Sign: one of
 *         + -
 * TwoDigitHours:
 *         Digit Digit
 * Minutes:
 *         Digit Digit
 * Digit: one of
 *         0 1 2 3 4 5 6 7 8 9
 *
* For example, TimeZone.getTimeZone("GMT-8").getID() returns "GMT-08:00". * *

Three-letter time zone IDs

* * For compatibility with JDK 1.1.x, some other three-letter time zone IDs * (such as "PST", "CTT", "AST") are also supported. However, their * use is deprecated because the same abbreviation is often used * for multiple time zones (for example, "CST" could be U.S. "Central Standard * Time" and "China Standard Time"), and the Java platform can then only * recognize one of them. * * * @see Calendar * @see GregorianCalendar * @see SimpleTimeZone * @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu * @since JDK1.1 */ abstract public class TimeZone implements Serializable, Cloneable { /** * Sole constructor. (For invocation by subclass constructors, typically * implicit.) */ public TimeZone() { } /** * A style specifier for getDisplayName() indicating * a short name, such as "PST." * @see #LONG * @since 1.2 */ public static final int SHORT = 0; /** * A style specifier for getDisplayName() indicating * a long name, such as "Pacific Standard Time." * @see #SHORT * @since 1.2 */ public static final int LONG = 1; // Constants used internally; unit is milliseconds private static final int ONE_MINUTE = 60*1000; private static final int ONE_HOUR = 60*ONE_MINUTE; private static final int ONE_DAY = 24*ONE_HOUR; // Proclaim serialization compatibility with JDK 1.1 static final long serialVersionUID = 3581463369166924961L; /** * Gets the time zone offset, for current date, modified in case of * daylight savings. This is the offset to add to UTC to get local time. *

* This method returns a historically correct offset if an * underlying TimeZone implementation subclass * supports historical Daylight Saving Time schedule and GMT * offset changes. * * @param era the era of the given date. * @param year the year in the given date. * @param month the month in the given date. * Month is 0-based. e.g., 0 for January. * @param day the day-in-month of the given date. * @param dayOfWeek the day-of-week of the given date. * @param milliseconds the milliseconds in day in standard * local time. * * @return the offset in milliseconds to add to GMT to get local time. * * @see Calendar#ZONE_OFFSET * @see Calendar#DST_OFFSET */ public abstract int getOffset(int era, int year, int month, int day, int dayOfWeek, int milliseconds); /** * Returns the offset of this time zone from UTC at the specified * date. If Daylight Saving Time is in effect at the specified * date, the offset value is adjusted with the amount of daylight * saving. *

* This method returns a historically correct offset value if an * underlying TimeZone implementation subclass supports historical * Daylight Saving Time schedule and GMT offset changes. * * @param date the date represented in milliseconds since January 1, 1970 00:00:00 GMT * @return the amount of time in milliseconds to add to UTC to get local time. * * @see Calendar#ZONE_OFFSET * @see Calendar#DST_OFFSET * @since 1.4 */ public int getOffset(long date) { if (inDaylightTime(new Date(date))) { return getRawOffset() + getDSTSavings(); } return getRawOffset(); } /** * Gets the raw GMT offset and the amount of daylight saving of this * time zone at the given time. * @param date the milliseconds (since January 1, 1970, * 00:00:00.000 GMT) at which the time zone offset and daylight * saving amount are found * @param offsets an array of int where the raw GMT offset * (offset[0]) and daylight saving amount (offset[1]) are stored, * or null if those values are not needed. The method assumes that * the length of the given array is two or larger. * @return the total amount of the raw GMT offset and daylight * saving at the specified date. * * @see Calendar#ZONE_OFFSET * @see Calendar#DST_OFFSET */ int getOffsets(long date, int[] offsets) { int rawoffset = getRawOffset(); int dstoffset = 0; if (inDaylightTime(new Date(date))) { dstoffset = getDSTSavings(); } if (offsets != null) { offsets[0] = rawoffset; offsets[1] = dstoffset; } return rawoffset + dstoffset; } /** * Sets the base time zone offset to GMT. * This is the offset to add to UTC to get local time. *

* If an underlying TimeZone implementation subclass * supports historical GMT offset changes, the specified GMT * offset is set as the latest GMT offset and the difference from * the known latest GMT offset value is used to adjust all * historical GMT offset values. * * @param offsetMillis the given base time zone offset to GMT. */ abstract public void setRawOffset(int offsetMillis); /** * Returns the amount of time in milliseconds to add to UTC to get * standard time in this time zone. Because this value is not * affected by daylight saving time, it is called raw * offset. *

* If an underlying TimeZone implementation subclass * supports historical GMT offset changes, the method returns the * raw offset value of the current date. In Honolulu, for example, * its raw offset changed from GMT-10:30 to GMT-10:00 in 1947, and * this method always returns -36000000 milliseconds (i.e., -10 * hours). * * @return the amount of raw offset time in milliseconds to add to UTC. * @see Calendar#ZONE_OFFSET */ public abstract int getRawOffset(); /** * Gets the ID of this time zone. * @return the ID of this time zone. */ public String getID() { return ID; } /** * Sets the time zone ID. This does not change any other data in * the time zone object. * @param ID the new time zone ID. */ public void setID(String ID) { if (ID == null) { throw new NullPointerException(); } this.ID = ID; } /** * Returns a long standard time name of this {@code TimeZone} suitable for * presentation to the user in the default locale. * *

This method is equivalent to: * 


     * getDisplayName(false, {@link #LONG},
     *                Locale.getDefault({@link Locale.Category#DISPLAY}))
     *
* * @return the human-readable name of this time zone in the default locale. * @since 1.2 * @see #getDisplayName(boolean, int, Locale) * @see Locale#getDefault(Locale.Category) * @see Locale.Category */ public final String getDisplayName() { return getDisplayName(false, LONG, Locale.getDefault(Locale.Category.DISPLAY)); } /** * Returns a long standard time name of this {@code TimeZone} suitable for * presentation to the user in the specified {@code locale}. * *

This method is equivalent to: * 


     * getDisplayName(false, {@link #LONG}, locale)
     *
* * @param locale the locale in which to supply the display name. * @return the human-readable name of this time zone in the given locale. * @exception NullPointerException if {@code locale} is {@code null}. * @since 1.2 * @see #getDisplayName(boolean, int, Locale) */ public final String getDisplayName(Locale locale) { return getDisplayName(false, LONG, locale); } /** * Returns a name in the specified {@code style} of this {@code TimeZone} * suitable for presentation to the user in the default locale. If the * specified {@code daylight} is {@code true}, a Daylight Saving Time name * is returned (even if this {@code TimeZone} doesn't observe Daylight Saving * Time). Otherwise, a Standard Time name is returned. * *

This method is equivalent to: * 


     * getDisplayName(daylight, style,
     *                Locale.getDefault({@link Locale.Category#DISPLAY}))
     *
* * @param daylight {@code true} specifying a Daylight Saving Time name, or * {@code false} specifying a Standard Time name * @param style either {@link #LONG} or {@link #SHORT} * @return the human-readable name of this time zone in the default locale. * @exception IllegalArgumentException if {@code style} is invalid. * @since 1.2 * @see #getDisplayName(boolean, int, Locale) * @see Locale#getDefault(Locale.Category) * @see Locale.Category * @see java.text.DateFormatSymbols#getZoneStrings() */ public final String getDisplayName(boolean daylight, int style) { return getDisplayName(daylight, style, Locale.getDefault(Locale.Category.DISPLAY)); } /** * Returns a name in the specified {@code style} of this {@code TimeZone} * suitable for presentation to the user in the specified {@code * locale}. If the specified {@code daylight} is {@code true}, a Daylight * Saving Time name is returned (even if this {@code TimeZone} doesn't * observe Daylight Saving Time). Otherwise, a Standard Time name is * returned. * *

When looking up a time zone name, the {@linkplain * ResourceBundle.Control#getCandidateLocales(String,Locale) default * Locale search path of ResourceBundle} derived * from the specified {@code locale} is used. (No {@linkplain * ResourceBundle.Control#getFallbackLocale(String,Locale) fallback * Locale} search is performed.) If a time zone name in any * {@code Locale} of the search path, including {@link Locale#ROOT}, is * found, the name is returned. Otherwise, a string in the * normalized custom ID format is returned. * * @param daylight {@code true} specifying a Daylight Saving Time name, or * {@code false} specifying a Standard Time name * @param style either {@link #LONG} or {@link #SHORT} * @param locale the locale in which to supply the display name. * @return the human-readable name of this time zone in the given locale. * @exception IllegalArgumentException if {@code style} is invalid. * @exception NullPointerException if {@code locale} is {@code null}. * @since 1.2 * @see java.text.DateFormatSymbols#getZoneStrings() */ public String getDisplayName(boolean daylight, int style, Locale locale) { if (style != SHORT && style != LONG) { throw new IllegalArgumentException("Illegal style: " + style); } String id = getID(); String[] names = getDisplayNames(id, locale); if (names == null) { if (id.startsWith("GMT") && id.length() > 3) { char sign = id.charAt(3); if (sign == '+' || sign == '-') { return id; } } int offset = getRawOffset(); if (daylight) { offset += getDSTSavings(); } return ZoneInfoFile.toCustomID(offset); } int index = daylight ? 3 : 1; if (style == SHORT) { index++; } return names[index]; } private static class DisplayNames { // Cache for managing display names per timezone per locale // The structure is: // Map(key=id, value=SoftReference(Map(key=locale, value=displaynames))) private static final Map>> CACHE = new ConcurrentHashMap<>(); } private static final String[] getDisplayNames(String id, Locale locale) { Map>> displayNames = DisplayNames.CACHE; SoftReference> ref = displayNames.get(id); if (ref != null) { Map perLocale = ref.get(); if (perLocale != null) { String[] names = perLocale.get(locale); if (names != null) { return names; } names = TimeZoneNameUtility.retrieveDisplayNames(id, locale); if (names != null) { perLocale.put(locale, names); } return names; } } String[] names = TimeZoneNameUtility.retrieveDisplayNames(id, locale); if (names != null) { Map perLocale = new ConcurrentHashMap<>(); perLocale.put(locale, names); ref = new SoftReference<>(perLocale); displayNames.put(id, ref); } return names; } /** * Returns the amount of time to be added to local standard time * to get local wall clock time. * *

The default implementation returns 3600000 milliseconds * (i.e., one hour) if a call to {@link #useDaylightTime()} * returns {@code true}. Otherwise, 0 (zero) is returned. * *

If an underlying {@code TimeZone} implementation subclass * supports historical and future Daylight Saving Time schedule * changes, this method returns the amount of saving time of the * last known Daylight Saving Time rule that can be a future * prediction. * *

If the amount of saving time at any given time stamp is * required, construct a {@link Calendar} with this {@code * TimeZone} and the time stamp, and call {@link Calendar#get(int) * Calendar.get}{@code (}{@link Calendar#DST_OFFSET}{@code )}. * * @return the amount of saving time in milliseconds * @since 1.4 * @see #inDaylightTime(Date) * @see #getOffset(long) * @see #getOffset(int,int,int,int,int,int) * @see Calendar#ZONE_OFFSET */ public int getDSTSavings() { if (useDaylightTime()) { return 3600000; } return 0; } /** * Queries if this {@code TimeZone} uses Daylight Saving Time. * *

If an underlying {@code TimeZone} implementation subclass * supports historical and future Daylight Saving Time schedule * changes, this method refers to the last known Daylight Saving Time * rule that can be a future prediction and may not be the same as * the current rule. Consider calling {@link #observesDaylightTime()} * if the current rule should also be taken into account. * * @return {@code true} if this {@code TimeZone} uses Daylight Saving Time, * {@code false}, otherwise. * @see #inDaylightTime(Date) * @see Calendar#DST_OFFSET */ public abstract boolean useDaylightTime(); /** * Returns {@code true} if this {@code TimeZone} is currently in * Daylight Saving Time, or if a transition from Standard Time to * Daylight Saving Time occurs at any future time. * *

The default implementation returns {@code true} if * {@code useDaylightTime()} or {@code inDaylightTime(new Date())} * returns {@code true}. * * @return {@code true} if this {@code TimeZone} is currently in * Daylight Saving Time, or if a transition from Standard Time to * Daylight Saving Time occurs at any future time; {@code false} * otherwise. * @since 1.7 * @see #useDaylightTime() * @see #inDaylightTime(Date) * @see Calendar#DST_OFFSET */ public boolean observesDaylightTime() { return useDaylightTime() || inDaylightTime(new Date()); } /** * Queries if the given {@code date} is in Daylight Saving Time in * this time zone. * * @param date the given Date. * @return {@code true} if the given date is in Daylight Saving Time, * {@code false}, otherwise. */ abstract public boolean inDaylightTime(Date date); /** * Gets the TimeZone for the given ID. * * @param ID the ID for a TimeZone, either an abbreviation * such as "PST", a full name such as "America/Los_Angeles", or a custom * ID such as "GMT-8:00". Note that the support of abbreviations is * for JDK 1.1.x compatibility only and full names should be used. * * @return the specified TimeZone, or the GMT zone if the given ID * cannot be understood. */ public static synchronized TimeZone getTimeZone(String ID) { return getTimeZone(ID, true); } private static TimeZone getTimeZone(String ID, boolean fallback) { TimeZone tz = ZoneInfo.getTimeZone(ID); if (tz == null) { tz = parseCustomTimeZone(ID); if (tz == null && fallback) { tz = new ZoneInfo(GMT_ID, 0); } } return tz; } /** * Gets the available IDs according to the given time zone offset in milliseconds. * * @param rawOffset the given time zone GMT offset in milliseconds. * @return an array of IDs, where the time zone for that ID has * the specified GMT offset. For example, "America/Phoenix" and "America/Denver" * both have GMT-07:00, but differ in daylight saving behavior. * @see #getRawOffset() */ public static synchronized String[] getAvailableIDs(int rawOffset) { return ZoneInfo.getAvailableIDs(rawOffset); } /** * Gets all the available IDs supported. * @return an array of IDs. */ public static synchronized String[] getAvailableIDs() { return ZoneInfo.getAvailableIDs(); } /** * Gets the platform defined TimeZone ID. **/ private static native String getSystemTimeZoneID(String javaHome, String country); /** * Gets the custom time zone ID based on the GMT offset of the * platform. (e.g., "GMT+08:00") */ private static native String getSystemGMTOffsetID(); /** * Gets the default TimeZone for this host. * The source of the default TimeZone * may vary with implementation. * @return a default TimeZone. * @see #setDefault */ public static TimeZone getDefault() { return (TimeZone) getDefaultRef().clone(); } /** * Returns the reference to the default TimeZone object. This * method doesn't create a clone. */ static TimeZone getDefaultRef() { TimeZone defaultZone = getDefaultInAppContext(); if (defaultZone == null) { defaultZone = defaultTimeZone; if (defaultZone == null) { // Need to initialize the default time zone. defaultZone = setDefaultZone(); assert defaultZone != null; } } // Don't clone here. return defaultZone; } private static synchronized TimeZone setDefaultZone() { TimeZone tz = null; // get the time zone ID from the system properties String zoneID = AccessController.doPrivileged( new GetPropertyAction("user.timezone")); // if the time zone ID is not set (yet), perform the // platform to Java time zone ID mapping. if (zoneID == null || zoneID.equals("")) { String country = AccessController.doPrivileged( new GetPropertyAction("user.country")); String javaHome = AccessController.doPrivileged( new GetPropertyAction("java.home")); try { zoneID = getSystemTimeZoneID(javaHome, country); if (zoneID == null) { zoneID = GMT_ID; } } catch (NullPointerException e) { zoneID = GMT_ID; } } // Get the time zone for zoneID. But not fall back to // "GMT" here. tz = getTimeZone(zoneID, false); if (tz == null) { // If the given zone ID is unknown in Java, try to // get the GMT-offset-based time zone ID, // a.k.a. custom time zone ID (e.g., "GMT-08:00"). String gmtOffsetID = getSystemGMTOffsetID(); if (gmtOffsetID != null) { zoneID = gmtOffsetID; } tz = getTimeZone(zoneID, true); } assert tz != null; final String id = zoneID; AccessController.doPrivileged(new PrivilegedAction() { public Object run() { System.setProperty("user.timezone", id); return null; } }); defaultTimeZone = tz; return tz; } private static boolean hasPermission() { boolean hasPermission = true; SecurityManager sm = System.getSecurityManager(); if (sm != null) { try { sm.checkPermission(new PropertyPermission ("user.timezone", "write")); } catch (SecurityException e) { hasPermission = false; } } return hasPermission; } /** * Sets the TimeZone that is * returned by the getDefault method. If zone * is null, reset the default to the value it had originally when the * VM first started. * @param zone the new default time zone * @see #getDefault */ public static void setDefault(TimeZone zone) { if (hasPermission()) { synchronized (TimeZone.class) { defaultTimeZone = zone; setDefaultInAppContext(null); } } else { setDefaultInAppContext(zone); } } /** * Returns the default TimeZone in an AppContext if any AppContext * has ever used. null is returned if any AppContext hasn't been * used or if the AppContext doesn't have the default TimeZone. */ private synchronized static TimeZone getDefaultInAppContext() { // JavaAWTAccess provides access implementation-private methods without using reflection. JavaAWTAccess javaAWTAccess = SharedSecrets.getJavaAWTAccess(); // Note that javaAWTAccess may be null if sun.awt.AppContext class hasn't // been loaded. If so, it implies that AWTSecurityManager is not our // SecurityManager and we can use a local static variable. // This works around a build time issue. if (javaAWTAccess == null) { return mainAppContextDefault; } else { if (!javaAWTAccess.isDisposed()) { TimeZone tz = (TimeZone) javaAWTAccess.get(TimeZone.class); if (tz == null && javaAWTAccess.isMainAppContext()) { return mainAppContextDefault; } else { return tz; } } } return null; } /** * Sets the default TimeZone in the AppContext to the given * tz. null is handled special: do nothing if any AppContext * hasn't been used, remove the default TimeZone in the * AppContext otherwise. */ private synchronized static void setDefaultInAppContext(TimeZone tz) { // JavaAWTAccess provides access implementation-private methods without using reflection. JavaAWTAccess javaAWTAccess = SharedSecrets.getJavaAWTAccess(); // Note that javaAWTAccess may be null if sun.awt.AppContext class hasn't // been loaded. If so, it implies that AWTSecurityManager is not our // SecurityManager and we can use a local static variable. // This works around a build time issue. if (javaAWTAccess == null) { mainAppContextDefault = tz; } else { if (!javaAWTAccess.isDisposed()) { javaAWTAccess.put(TimeZone.class, tz); if (javaAWTAccess.isMainAppContext()) { mainAppContextDefault = null; } } } } /** * Returns true if this zone has the same rule and offset as another zone. * That is, if this zone differs only in ID, if at all. Returns false * if the other zone is null. * @param other the TimeZone object to be compared with * @return true if the other zone is not null and is the same as this one, * with the possible exception of the ID * @since 1.2 */ public boolean hasSameRules(TimeZone other) { return other != null && getRawOffset() == other.getRawOffset() && useDaylightTime() == other.useDaylightTime(); } /** * Creates a copy of this TimeZone. * * @return a clone of this TimeZone */ public Object clone() { try { TimeZone other = (TimeZone) super.clone(); other.ID = ID; return other; } catch (CloneNotSupportedException e) { throw new InternalError(e); } } /** * The null constant as a TimeZone. */ static final TimeZone NO_TIMEZONE = null; // =======================privates=============================== /** * The string identifier of this TimeZone. This is a * programmatic identifier used internally to look up TimeZone * objects from the system table and also to map them to their localized * display names. ID values are unique in the system * table but may not be for dynamically created zones. * @serial */ private String ID; private static volatile TimeZone defaultTimeZone; static final String GMT_ID = "GMT"; private static final int GMT_ID_LENGTH = 3; // a static TimeZone we can reference if no AppContext is in place private static TimeZone mainAppContextDefault; /** * Parses a custom time zone identifier and returns a corresponding zone. * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm) * * @param id a string of the custom ID form. * @return a newly created TimeZone with the given offset and * no daylight saving time, or null if the id cannot be parsed. */ private static final TimeZone parseCustomTimeZone(String id) { int length; // Error if the length of id isn't long enough or id doesn't // start with "GMT". if ((length = id.length()) < (GMT_ID_LENGTH + 2) || id.indexOf(GMT_ID) != 0) { return null; } ZoneInfo zi; // First, we try to find it in the cache with the given // id. Even the id is not normalized, the returned ZoneInfo // should have its normalized id. zi = ZoneInfoFile.getZoneInfo(id); if (zi != null) { return zi; } int index = GMT_ID_LENGTH; boolean negative = false; char c = id.charAt(index++); if (c == '-') { negative = true; } else if (c != '+') { return null; } int hours = 0; int num = 0; int countDelim = 0; int len = 0; while (index < length) { c = id.charAt(index++); if (c == ':') { if (countDelim > 0) { return null; } if (len > 2) { return null; } hours = num; countDelim++; num = 0; len = 0; continue; } if (c < '0' || c > '9') { return null; } num = num * 10 + (c - '0'); len++; } if (index != length) { return null; } if (countDelim == 0) { if (len <= 2) { hours = num; num = 0; } else { hours = num / 100; num %= 100; } } else { if (len != 2) { return null; } } if (hours > 23 || num > 59) { return null; } int gmtOffset = (hours * 60 + num) * 60 * 1000; if (gmtOffset == 0) { zi = ZoneInfoFile.getZoneInfo(GMT_ID); if (negative) { zi.setID("GMT-00:00"); } else { zi.setID("GMT+00:00"); } } else { zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset); } return zi; } }