ios 时间类转化为字符串详解手机开发

// NSString* timeStr = [self stringWithDate: [NSDate dateWithTimeIntervalSince1970:userGifGrouptEntity.lastGiftSentTime / 1000]] 

- (NSString *)stringWithDate:(NSDate *)date { 

 if (date == nil) 

 return @""; 

 NSDate *now = [NSDate date]; 

 NSTimeInterval time = [now timeIntervalSinceDate:date]; 

 NSCalendar* calendar = [NSCalendar currentCalendar]; 

 NSDateComponents *nowComponents = [calendar components:NSYearCalendarUnit | NSHourCalendarUnit fromDate:now]; 

 NSDateComponents *dateComponets = [calendar components:NSYearCalendarUnit fromDate:date];