wikimedia / mediawiki

		// Calculate min/max attributes (which are skipped by TextInputWidget) and add to <input>

		// min/max attributes are inclusive, but mustBeAfter/Before are exclusive

		if ( $this->mustBeAfter !== null ) {

			$min = new DateTime( $this->mustBeAfter );

			$min = $min->modify( '+1 day' );

			$min = $min->format( 'Y-m-d' );

			$this->input->setAttributes( [ 'min' => $min ] );

		}

		if ( $this->mustBeBefore !== null ) {

			$max = new DateTime( $this->mustBeBefore );

			$max = $max->modify( '-1 day' );

			$min = $min->format( 'Y-m-d' );

			$this->input->setAttributes( [ 'min' => $min ] );

		}

		if ( $this->mustBeBefore !== null ) {

			$max = new DateTime( $this->mustBeBefore );

			$max = $max->modify( '-1 day' );

			$max = $max->format( 'Y-m-d' );

			$this->input->setAttributes( [ 'max' => $max ] );

		}

		// Initialization

		$this->addClasses( [ 'mw-widget-dateInputWidget' ] );