It's not a bug. It's just that "S" has never been supported.
I've now added this for 1.10. The patch is not difficult:

--- blogs/inc/_misc/_request.class.php  30 Nov 2006 21:33:46 -0000      1.19.2.5
+++ blogs/inc/_misc/_request.class.php  25 Feb 2007 17:50:01 -0000
@@ -601,6 +601,7 @@
                                case "D": return "(".str_replace("~", "\~", implode("|", array_map("trim", array_map("T_", $GLOBALS["weekday_abbrev"])))).")";
                                case "e": // b2evo extension!
                                        return "(".str_replace("~", "\~", implode("|", array_map("trim", array_map("T_", $GLOBALS["weekday_letter"])))).")";
+                               case "S": return "(st|nd|rd|th)"; // english suffix for day

                                case "m": return "([0-1]\\d)"; // month, 01-12
                                case "n": return "(1?\\d)"; // month, 1-12

and

diff -u -r1.1.8.1 date.js
--- blogs/rsc/js/date.js        26 Sep 2006 21:47:33 -0000      1.1.8.1
+++ blogs/rsc/js/date.js        25 Feb 2007 17:50:00 -0000
@@ -144,6 +147,20 @@
        value["mm"]=LZ(m);
        value["s"]=s;
        value["ss"]=LZ(s);
+
+       // english ordinal numbers (see http://en.wikipedia.org/wiki/Names_of_numbers_in_English#Ordinal_numbers):
+       if( d < 20 && d > 9 )
+       {
+               value["S"] = "th";
+       }
+       else switch( d % 10 )
+       {
+               case 1: value["S"] = "st"; break;
+               case 2: value["S"] = "nd"; break;
+               case 3: value["S"] = "rd"; break;
+               default: value["S"] = "th"; break;
+       }
+
        while (i_format < format.length) {
                c=format.charAt(i_format);
                if( c == "\\" )

If you don't know how to patch those two files according to the snippets above you'll have to wait for 1.10.

Thanks - I'll have a look into it ASAP

Sorry for taking so long but I finally found time to apply the patch above (dissertations and stuff have to take precedence I'm afraid :( )

Anyway, I'm still getting a "Please enter a valid issue date" error message when I try to edit a post :(

Is it definitely only one line in the request class?

Please retry reproducing it at the demo site, with the CVS HEAD version. If you can reproduce it, I'll look into it again.

i changed the date format in regional settings to d F Y
then i can create a post without problems
when i go to edit it, i get the same error: "please enter a valid issue date"

the problem is in "/inc/_vars.inc.php"
on line 217 there is an extra space after may:

$month['05'] = NT_('May ');

it should:

$month['05'] = NT_('May');

can we get that fixed globally!?!

thanks

morphosic, do you have seen the comment why it's "May "?!
Therefor, a better fix is: http://evocms.cvs.sourceforge.net/evocms/b2evolution/blogs/inc/_misc/_misc.funcs.php?r1=1.174&r2=1.175 (this is for CVS HEAD/2.0)

In this context, the following patch might also help:
http://evocms.cvs.sourceforge.net/evocms/b2evolution/blogs/inc/_misc/_param.funcs.php?r1=1.36&r2=1.37

why does there need to be a differentiation between the short form and long form...?

why is this still an ongoing problem?
is this going to be fixed in the next release?

morphosic, "ongoing problem"?
I've just applied the fix for v-1-10, so it should be in 1.10.1.
There needs to be "May" and "May " so that translators can have short and long versions of the same month (what the comment says).

i say 'ongoing' becaues this was apparantly an issue in earlier releases... which is how i found what about the 'may ' thing...