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use strict;
use warnings;
...
    my $tp = Time::Piece->strptime( $date, q{%Y-%m-%d %T} );
    say $date, q{ -> epoch }, $tp->epoch();
}

1960-12-31 23:59:59 -> epoch -283996801
1966-06-24 09:44:00 -> epoch -111161760
...
1901-01-01 00:00:00 -> epoch -2177452800
1900-01-01 00:00:00 -> epoch -2208988800
Error parsing time at /usr/lib/x86_64-linux-gnu/perl/5.22/Time/Piece.p
+m line 469.