Android Daylight savings time設置問題

Android中對 Daylight savings time的處理是根據時區來處理的。

framework/com/android/server/AlarmManagerService.java有說明。

 TimeZone zone = TimeZone.getTimeZone(tz);

261	// Prevent reentrant calls from stepping on each other when writing

262	// the time zone property

263	boolean timeZoneWasChanged = false;

264	synchronized (this) {

265	String current = SystemProperties.get(TIMEZONE_PROPERTY);

266	if (current == null || !current.equals(zone.getID())) {

267	if (localLOGV) Slog.v(TAG, "timezone changed: " + current + ", new=" + zone.getID());

268	timeZoneWasChanged = true;

269	SystemProperties.set(TIMEZONE_PROPERTY, zone.getID());

270

}

271

272	// Update the kernel timezone information

273	// Kernel tracks time offsets as 'minutes west of GMT'

274	int gmtOffset = zone.getRawOffset();

275	if (zone.inDaylightTime(new Date(System.currentTimeMillis()))) {

276	gmtOffset += zone.getDSTSavings();

277

}

278	setKernelTimezone(mDescriptor, -(gmtOffset / 60000));

279

}

280

281	TimeZone.setDefault(null);