Custom field date filter

Hi,

I was wondering if the following is possible:

I use Rental and Booking plugin which sets a pickup datetime and drop off datetime.
Two custom fields:
_pickup_hidden_datetime
_return_hidden_datetime

I want two scheduled jobs for each one for all orders with a filter on ‘today’.
Data format in both is e.g. 21-01-29|00:00.

What I would need is a filter query that does, for ‘_pickup_hidden_datetime’ for example: {today} but only uses the date, not time. Or else inbetween {today}|00:01 and {today}|23:59

Thanks in advance,

Jules