BAD : Doctors read these journals so as not to become out of date.
GOOD : Doctors read these journals so as to keep up to date.
Out of date (before a noun out-of-date ) is used in connection with information, ideas, knowledge, technology etc (NOT people): 'A significant proportion of what children are studying at school will be out of date within the space of a few years.'
If you always have the latest information about something, you keep up to date ( with developments) or keep abreast ( of developments): 'Lecturers are expected to keep abreast of developments in their subject areas.'
BAD : On the date of your wedding, I shall be in England.
GOOD : On the day of your wedding, I shall be in England.
BAD : I have to pay the rent on the first date of the month.
GOOD : I have to pay the rent on the first day of the month.
on the day of sth (NOT on the date of ): 'On the day of my departure, I woke up very early.'
BAD : I have an interview at the same date.
GOOD : I have an interview on the same date/day.
on a specific date/day (NOT at/in ): 'I'm afraid we have no rooms available on that date.'
Note, however, the phrases at a later date and at some future date : 'The rest of the money can be paid at a later date.'
BAD : Up to date, they still haven't answered our letter.
GOOD : To date, they still haven't answered our letter.
to date or up to/until now (NOT up to date ): 'To date there are no signs that the situation is likely to improve.'
See UP-TO-DATE (↑ up-to-date )