<input type="datetime-local" name="" id="">
//Incase you need to add both date and time
<input type="time" name="" id="">
//For just time<!DOCTYPE html>
<html>
<body>
<form action="url here">
<label for="time">Select a time:</label>
<input type="time" id="time input" name="time input:">
<input type="submit">
</form>
</body>
</html>