将String转换为Date并获取差异 [英] Convert String to Date and fetch the difference

问题描述

我有2个字符串格式的日期

hi i have 2 dates in string format

base_date_string = 10-12-01 12:00:00current_date_string = 10-12-23 10:18:00以上两个值都在字符串中

base_date_string = 10-12-01 12:00:00 current_date_string = 10-12-23 10:18:00 both the above values are in string

我想获取这两个日期之间经过的天数

i want to get the number of days elapsed between these 2 dates

我尝试使用NSDateFormatters将它们转换为NSDate，然后得到区别.我意识到字符串无法正确转换为NSDate

I tried to convert them to NSDate using NSDateFormatters and then getting the difference. I realised that string does not properly converts to NSDate

当我转换为nsdate时，我得到了base_date ::: 2010-12-01 06:30:00 +0000current_date ::::: 2010-12-23 04:48:19 +0000(时间部分不完美)

when i convert to nsdate i got base_date:::2010-12-01 06:30:00 +0000 current_date::::2010-12-23 04:48:19 +0000 (the time portion is not perfect)

Formatter类是:

Formatter class that i used is:

    NSDateFormatter *formatter1 = [[NSDateFormatter alloc] init];
    [formatter1 setDateFormat:@"yy-MM-dd HH:mm:ss"];
    NSDate *base_date = [formatter1 dateFromString:@"10-12-01 12:00:00"];
    [formatter1 release];

    NSDateFormatter *formatter2 = [[NSDateFormatter alloc] init];
    [formatter2 setDateFormat:@"yy-MM-dd HH:mm:ss"];
    NSDate *current_date = [formatter2 dateFromString:current_date_string];
    [formatter2 release];

//从当前日期开始对基准日期进行计数，以获取经过的天数

//subrtrcation of basedate from current date to get elapsed number of days

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *diff = [calendar components:(NSDayCalendarUnit)                       
                         fromDate:base_date toDate:current_date options:0];
int date_value = [diff day];

请提供任何帮助

推荐答案

30秒:

因此，使用您问题中的日期...

So using the dates in your question...

NSTimeInterval difference = [current_date timeIntervalSinceDate:base_date];
difference = fabs(difference);
NSLog(@"there are %f seconds between %@ and %@", difference, current_date, base_date);

修改

好，所以问题不在于日期差异.您会发现您输入的字符串比您返回的日期早5和1/2小时.

ok, so the problem is not date differencing. You're observing that the string you're inputting is 5 and 1/2 hours ahead of the date you're getting back.

好吧，让我们来看一下.返回的日期为格林尼治标准时间(以 +0000 表示).在此之前的5和1/2小时是印度使用的时区.所以.你在印度吗如果您愿意，那么只需在 NSDateFormatter 上的 -setTimezone:.

Well, let's look at this. The date returned is in GMT time (as denoted by the +0000). 5 and 1/2 hours ahead of that is the timezone used in India. So. Are you in India? If you are, then this is just a matter of needing to -setTimezone: on your NSDateFormatter.

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