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Last active August 29, 2015 14:28
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Get Local Time
기존의 획득한 시간 정보를 timezone이 변경이 되더라도 동일하게 표기하기 위해 사용되는 함수
long beforeTime = System.currentTimeMillis();
long beforeOffSet = TimeZone.getDefault().getOffset(beforeTime);
// 중간에 TimeZone이 변경되더라도 beforeTime과 beforeOffSet을 알고 있으면 변경된 timezone에서의 동일하게 표기되는 년/월/일/시/분/초 정보인 epoch time을 획득할 수 있다.
long afterTime = getCurrentLocalTime(beforeTime, beforeOffSet);
public static long getCurrentLocalTime(long localTime, long timeOffset) {
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendar.setTimeInMillis(localTime + timeOffset);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
int milliSecond = calendar.get(Calendar.MILLISECOND);
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month);
calendar.set(Calendar.DAY_OF_MONTH, day);
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, second);
calendar.set(Calendar.MILLISECOND, milliSecond);
return calendar.getTimeInMillis();
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