Assuming your examples are definitive, this GRT should work for you:
#! perl -slw
use strict;
my %months = (
FY => 0,
Jan => 1, Feb => 2, Mar => 3, Apr => 4, May => 5, Jun => 6,
Jul => 7, Aug => 8, Sep => 9, Oct => 10, Nov => 11, Dec => 12,
);
print for map{
unpack 'x[nn]A*', $_
} sort map {
my( $alpha, $num ) = m[^(\S+?)\s*(\d+)$];
$num += 2000 if $num <= 49;
$num += 1900 if $num <= 99;
pack 'nnA*', $num, $months{ $alpha }, $_;
} <DATA>;
__DATA__
Apr 2006
FY05
FY98
FY04
Dec 2007
Jan 1997
Jan 1998
Dec 1998
Output
C:\test>junk
Jan 1997
FY98
Jan 1998
Dec 1998
FY04
FY05
Apr 2006
Dec 2007
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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