I need to convert the mm/dd ranges such as 0112 - 0402 into the filenames testnnn.txt where nnn = 012 for jan 12th, thru 092 for April 2nd, etc. Year is irrelevant, & leap year can be hard coded in the shortterm, since this will not be used past 2020. I've digressed to the following code, & it appears to work...
sub conv2jul {
   my $moda=shift;
   my @Days = (0,31,28,31,30,31,30,31,31,30,31,30,31);
   if ($leapyear) { $Days [2] = 29; }
   my $jul = 0;  my $i = 0;
   my $mo = substr($moda,0,2);
   my $da = substr($moda,2,2);
   if (($mo <= 0) || ($mo > 12)) { return "000"; }
   if (($da <= 0) || ($da > 31)) { return "000"; }
   for ($i = 0;$i < $mo;$i++) { $jul += $Days[$i]; }
   $jul += $da;
   return $jul;
}

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But I started with this & I'm curious as to why it doesn't work...
sub conv2jul {
   my $moda=shift;
   my @Days = (0,31,28,31,30,31,30,31,31,30,31,30,31);
   if ($leapyear) { $Days [2] = 29; }
   my $jul = 0;  my $i = 0;
   my $mo = substr($moda,0,2);
   my $da = substr($moda,2,2);
   if (($mo <= 0) || ($mo > 12)) { return "000"; }
   if (($da <= 0) || ($da > 31)) { return "000"; }
   $jul += ($Days[$mo..$mo-1]) + $da;     # his is the only diff
   return $jul;
}

[download]
I've tried several variation of this syntax, & I always get 0 returned in $jul. Is the range op just not usable in this scenario? More likely I've just hosed it beyond belief ;-) If you can see what I'm trying to accomplish & can offer any enlightenment I'd be very thankful.

In reply to Very Simple Conversion of Gregorian to Julian Calendar by Aim9b

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