This task has two parts: one is to find the first and last day of the current week, the other is to print the interval as a human-readable format. For the first, we'll use the Date::Manip::Date_GetPrev function which does the right thing. I have to hand-roll the second one.

Here's my solution. This assumes your dates start with Monday.

#!perl                                                                
+  
use warnings; use strict;                                             
+  
use Date::Manip;
my $mon = Date_GetPrev("now", "monday", 1, 8);       
my $fri = DateCalc($mon, "+4days");      
my($mony, $monm) = UnixDate($mon, "%y", "%m");
my($friy, $frim) = UnixDate($fri, "%y", "%m");
my $r;                          
if ($monm == $frim) {           
        $r = UnixDate($mon, "%B %e-") . UnixDate($fri, "%e, %Y\n")
} elsif ($mony == $friy) {                           
        $r = UnixDate($mon, "%B %e-") . UnixDate($fri, "%B %e, %Y\n")
} else {
        $r = die "homework for the reader";
}
print $r;
__END__
[download]