my $force_pref = shift; # if testing we want to override Context
if ( defined $str && $str =~ m/^\d{4}-\d{2}-\d{2}/ ) {
my $dt = dt_from_string( $str, 'sql' );
my $force_pref = shift; # if testing we want to override Context
if ( defined $str && $str =~ m/^\d{4}-\d{2}-\d{2}/ ) {
my $dt = dt_from_string( $str, 'sql' );