How can we enter planned start and end date in date and time format in Self-service Absence page?

We are trying to enter planned absence start and End dates in date and time format like '01-JAN-2022 HH:MM'). I see date picker allows us to choose date like '01-JAN-2022', but How can we extend it to date and time format?

I appreciate if you can share experience or knowledge.

Thanks,

Irfan