Re: Date Format Conversion

FROM : Brian Stern
DATE : Thu Jun 22 18:40:31 2006

At 1:11 PM -0300 6/22/06, Neto wrote:
>
>Anyway...just thoughts, because I don't know how to implement the
>"checkCurrentSystemDateFormat" or the "checkFirstTwoCharacters" methods.


Use NSScanner for checkFirstTwoCharacters.

http://developer.apple.com/documentation/Cocoa/Conceptual/Strings/Articles/Scanners.html


This code has worked for me to determine the system date format:

static BOOL    sDayBeforeMonth;    // Date format is dmy or mdy

// =======================================================================
// determineDateFormat
// =======================================================================
// Gets the user setting for date formatting, either MDY or DMY
// Also look at NSShortDateFormatString or NSDateFormatString
// NSDateTimeOrdering doesn't work.  It's apparently MDYH on all computers.
// NSShortDateFormatString is %1m/%e/%y on a US machine.  Can be displayed with
// defaults read NSGlobalDomain NSShortDateFormatString

- (void)determineDateFormat
{
   NSString* f = [[NSUserDefaults standardUserDefaults]
objectForKey:NSShortDateFormatString];
//    NSLog(@"%@  %@", f, NSShortDateFormatString);

   NSRange        rMonth, rDay;

   rMonth = [f rangeOfString:@"m"];
   if (rMonth.length == 0)
       rMonth = [f rangeOfString:@"b"];// not sure if this can happen
   if (rMonth.length == 0)
       rMonth = [f rangeOfString:@"B"];// not sure if this can happen
   rDay = [f rangeOfString:@"e"];
   if (rDay.length == 0)
       rDay = [f rangeOfString:@"d"];    // not sure if this can happen

   // Is it US format or EUR format?
   // MDYH or DMYH  @"%m/%d/%Y" or @"%d/%m/%Y"
   // The default in the nib is EUR format
   // Change to US format if we need to
   if (rMonth.location < rDay.location)    // User is US format
   {
       sDayBeforeMonth = NO;    // US format
   }
   else
   {
       sDayBeforeMonth = YES;    // EUR format
   }
//    NSLog(@"sDayBeforeMonth: %@", sDayBeforeMonth ? @"YES":@"NO");
}

// Return whether the user's date format is dmy, which is european style.
// returns false if user's date format is mdy, american style.

+ (BOOL)dateFormatIsDayBeforeMonth
{
   return sDayBeforeMonth;
}

--
Brian  Stern
<email_removed>