如何将@“2016-03-15 01:12:30”转换为NSDate并计算该日期与当前日期的差异？

Question

我使用过此代码，但输出日期不正确。

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
NSDate *date = [dateFormat dateFromString:dateStr];
NSDate * currDate = [NSDate date];

Answer 1

Here is sample code which uses for date difference.

Main problem is your date format causes the problem i.e 'hh' replace with 'HH'.

NSString *pastDate=@"2016-03-15 01:12:30";
NSDateFormatter *dateformat=[[NSDateFormatter alloc]init];
[dateformat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *datefor=[dateformat dateFromString:pastDate];
NSString *dateStr=[dateformat stringFromDate:datefor];
NSDate *datetype=[dateformat dateFromString:dateStr];



NSDate *currentDate = [NSDate date];
NSDateComponents *components;
NSInteger days;
components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay
                                             fromDate: datetype toDate: currentDate options: 0];
days = [components day];
 NSLog(@"There are %ld days in between the two dates.", (long)days);

May this helps.