转换东一到东八相差八小时时间
+(NSDate *)convertDateToLocalTime:(NSDate *)forDate {
NSTimeZone *nowTimeZone = [NSTimeZone localTimeZone];
int timeOffset = [nowTimeZone secondsFromGMTForDate:forDate];

NSDate *newDate = [forDate dateByAddingTimeInterval:timeOffset];
return newDate;
}