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<?php //Wrong DateInterval first Monday of January 2020, it progress year (+1, +2, etc) not have start or end this class. $timezone = new DateTimeZone( "UTC" ); $fmj = DateInterval::createFromDateString( 'first Monday of next month' ); $period = new DatePeriod( new DateTime( '2019-01-01 00:00:00.000000', $timezone ), $fmj, new DateTime( '2022-01-11 00:00:00.000000', $timezone ) ); $y = 0; foreach ( $period as $dt ) { $c[] = $period; $display[$y++] = $dt->format( "l Y-m-d H:i:s" ); //stop total_recurrence if( $y == 36 ) { break; } } $var = new DateTime( 'first monday of January', new DateTimeZone( "UTC" )); $display[36] = 'this relative date for DateTime class ' . ($var->format( "l Y-m-d H:i:s" )); var_dump( $display, $fmj, $c);

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