C:/xampp/htdocs/moodle/user/profile/field/datetime/field.class.php

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<?php

class profile_field_datetime extends profile_field_base {

    function edit_field_add($mform) {
        // Check if the field is required
        if ($this->field->required) {
            $optional = false;
        } else {
            $optional = true;
        }

        $attributes = array(
            'startyear' => $this->field->param1,
            'stopyear'  => $this->field->param2,
            'timezone'  => 99,
            'applydst'  => true,
            'optional'  => $optional
        );

        // Check if they wanted to include time as well
        if (!empty($this->field->param3)) {
            $mform->addElement('date_time_selector', $this->inputname, format_string($this->field->name), $attributes);
        } else {
            $mform->addElement('date_selector', $this->inputname, format_string($this->field->name), $attributes);
        }

        $mform->setType($this->inputname, PARAM_INT);
        $mform->setDefault($this->inputname, time());
    }

    function display_data() {
        // Check if time was specified
        if (!empty($this->field->param3)) {
            $format = get_string('strftimedaydatetime', 'langconfig');
        } else {
            $format = get_string('strftimedate', 'langconfig');
        }

        // Check if a date has been specified
        if (empty($this->data)) {
            return get_string('notset', 'profilefield_datetime');
        } else {
            return userdate($this->data, $format);
        }
    }
}