iOS时间戳和NSDate之间的相互转换

NSDate to TimeStamp

1.获取当前NSDate
NSDate *currentDate = [NSDate date];
2.转换成时间戳
NSString *strTimeStamp = [NSString stringWithFormat:@"%1f",[currentDate timeIntervalSince1970]];

TimeStamp to NSDate

NSString * timeStamp;
NSDate * timeStampToDate = [NSDate dateWithTimeIntevalSince1970:[timeStamp doubleValue]];