Why use a regex when split will do? :) 
my $date = '2/3/1906';
my $new_date = sprintf("%04d-%02d-%02d 00:00:00",(split /\//, $date)[2
+,1,0]);

# $new_date is "1906-03-02 00:00:00"

[download]

cLive ;-)

Update: As tachyon points out, I misread the question - the phrase "must be all zeroes" threw me :)

But again, I still say split :) 

my $new_date = sprintf("%04d-%02d-%02d %02d:%02d:00",(split /\D+/, $da
+te)[2,1,0,3,4]);

[download]

:)

In reply to Re: Re: Convert date format in database table. by cLive ;-)
in thread Convert date format in database table. by jdtoronto

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