iOS 获得当前时区的系统时间

NSDate*date = [NSDate date];// 获得时间对象

NSDateFormatter *forMatter = [[NSDateFormatter alloc] init];

NSTimeZone *zone = [NSTimeZone systemTimeZone]; // 获得当前系统的时区

[forMatter setTimeZone:zone];// 设定时区

[forMatter setDateFormat:@"yyyyMMdd"];

NSString*dateStr = [forMatter stringFromDate:date];