Question

我正在计算我的testapp中两个日期之间的差异。如果我不改变月份，但是当我改变月份它不起作用时，它工作正常。请帮我这里是我正在使用的代码： -

NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];
//[df setDateStyle:NSDateFormatterMediumStyle];
df.dateFormat = @"YYYY-MM-DD";

NSDate *date1 = [df dateFromString:@"2011-04-30"];
NSDate *date2 = [df dateFromString:@"2011-05-03"];

NSLog(@"date1=%@",date1);
NSLog(@"date2=%@",date2);
NSTimeInterval secondsBetween = [date2 timeIntervalSinceDate:date1];

int numberOfDays = secondsBetween / 86400;

NSLog(@"There are %d days in between the two dates.", numberOfDays);

输出为-27。我很困惑。

请有人帮我解决这个问题..

Answer 1

您也可以尝试这种方法，从中可以获得两个日期之间的任何差异......

-(NSString *)timeSinceTimestamp:(NSString *)seconds
{
   double seconds2 = [seconds doubleValue];

   NSDate *date = [NSDate dateWithTimeIntervalSince1970:seconds2];

   NSDate *now = [NSDate date];

   double start = [date timeIntervalSince1970];

   double end = [now timeIntervalSince1970];

   double difference = (end - start) / 1000;

   difference = round(difference);

   int minutes = difference / 60;

   int hours = minutes / 60;

   int days = hours / 24;

   int weeks = days / 7;

   int months = weeks / 5;

   int years = months / 12;

   NSString *string;

  

     if(difference < 60)
     {
        string = [NSString stringWithFormat:@"%i seconds ago",difference];

     }

     else if (minutes > 1 && minutes < 60)
     {
        string = [NSString stringWithFormat:@"%i minutes ago",minutes];
     }

     else if (hours > 1 && hours < 24)
     {
        string = [NSString stringWithFormat:@"%i hours ago",hours];
     }

     else if (days > 1 && days < 7) 
     {
       string = [NSString stringWithFormat:@"%i days ago",days];
     }



    else if (weeks > 1 && weeks < 5) 

   {

       string = [NSString stringWithFormat:@"%i weeks ago",weeks];

   }
   else if (months > 1  && months < 12) 

   {
       string = [NSString stringWithFormat:@"%i months ago",months];


   }
   else if (years > 1 && years < 12) 

   {

      
    string = [NSString stringWithFormat:@"%i years ago",years];


   }

     return string;

}

Answer 2

试试这个

NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];
        //[df setDateStyle:NSDateFormatterMediumStyle];
        //df.dateFormat = @"yyyy-mm-dd";
    [df setDateFormat:@"yyyy-MM-dd"];
    NSDate *date1 = [df dateFromString:@"2011-04-30"];
    NSDate *date2 = [df dateFromString:@"2011-05-03"];

NSLog(@"date1=%@",date1);
NSLog(@"date2=%@",date2);
NSTimeInterval secondsBetween = [date2 timeIntervalSinceDate:date1];

int numberOfDays = secondsBetween / 86400;

NSLog(@"There are %d days in between the two dates.", numberOfDays);

调整时区以获得正确的日期......

Answer 3

您必须说出您正在使用的NSDate格式：

NSDateFormatter *df = [[NSDateFormatter alloc] init];
df.dateFormat = @"yyyy'-'MM'-'dd";
NSLocale *local = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]; // Your locale
df.locale = local;
[local release];
df.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"]; // Your timezone
NSDate *date1 = [df dateFromString:@"2011-04-30"];
NSDate *date2 = [df dateFromString:@"2011-05-03"];
[df release];

Answer 4

更改

NSTimeInterval secondsBetween = [date2 timeIntervalSinceDate:date1];

到

NSTimeInterval secondsBetween = [date1 timeIntervalSinceDate:date2];

我怎样才能得到日期差异？

4 个答案: