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long long mServerDurationTime = (_mExpTime.longValue) - (serverTime.longValue);
long long curTime = [[NSDate date] timeIntervalSince1970] * 1000;
NSNumber newDeviceTime = (curTime + mServerDurationTime);
newDeviceTime을 NSNumber로 저장하려고합니다.긴 long을 NSnumber로 변환하는 방법은 무엇입니까?