Magento 2 : Form component

Copy<field name="start_time" formElement="input">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="source" xsi:type="string">milestone</item>
                </item>
            </argument>
            <settings>
                <elementTmpl>Vasan_Bidding/form/element/time_input</elementTmpl>
                <dataType>text</dataType>
                <visible>true</visible>
                <dataScope>start_time</dataScope>
                <label translate="true">Start Time</label>
                <validation>
                    <rule name="required-entry" xsi:type="boolean">false</rule>
                </validation>
            </settings>
        </field>

Copy

<input class="admin__control-text" type="time"
       data-bind="
        event: {change: userChanges},
        value: value,
        hasFocus: focused,
        valueUpdate: valueUpdate,
        attr: {
            name: inputName,
            placeholder: placeholder,
            'aria-describedby': noticeId,
            id: uid,
            disabled: disabled,
    }"/>