Objective-c基礎之NSDate與NSString、long型之間轉換

1、NSString 轉換成NSDate

    NSString *dateStr = “2013-6-3 14:58:00”;    NSDateFormatter *format=[[NSDateFormatter alloc] init];    [format setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSDate *date=[format dateFromString:dateStr];    

2、NSDate轉換成longlong型

    NSTimeInterval time = [date timeIntervalSince1970];    long long dTime = [[NSNumber numberWithDouble:time] longLongValue];

3、longlong型轉換成NSDate

    //java時間/1000就是objective-c的時間    long long value = [number longLongValue]/1000;//number是NSNumber型    NSNumber *time = [NSNumber numberWithLongLong:value];    //轉換成NSTimeInterval    NSTimeInterval nsTimeInterval = [time longValue];    NSDate *date = [[NSDate alloc] initWithTimeIntervalSince1970:nsTimeInterval];

4、NSDate型轉換成NSString

    NSDate *date = [NSDate date];    NSDateFormatter *format=[[NSDateFormatter alloc] init];    [format setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSString *dateString = [format stringFromDate:date];