When changing the time only will change the date to today.

[GasparYYC]

When changing the time only (sliding any of the two bars) it will immediately changes the date value to today's date.
Note: I use this n this modal form in which I pass a date to this field via Link Builder like this (I don't know if it matters):

Set Item:
Name: P46_EVENT_DATE Value: &P7_START_DATE.

So it shows fine when the modal opens, but as soon as I touch the time, it changes the date to today.
This occurs even if the Toggle Option "Today Botton" is checked off or not.

thanks

[GasparYYC]

Note:
I just tried the built-in datetime picker from APEX and it shows the same behaviour.
I'm not sure then what to do to make it stick to the date it was passed.