NSDate * senddate=[NSDate date];
NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"YYYYMMdd"];
NSString * locationString=[dateformatter stringFromDate:senddate];
NSLog(@"locationString:%@",locationString);
原文：http://www.cnblogs.com/KiVen2015/p/5731657.html