On the website, a message appears saying "date and time pending confirmation." Once the match is confirmed, the message disappears. If you bought your ticket without a confirmed date and time, you will receive an email with confirmation of these once they have been announced. On a Print at Home ticket, the kick off time is shown under the Match Day and Season, should it have been confirmed.
If the match is not confirmed, an approximate date appears with a note stating that the day and time are not confirmed.
It is always advisable to check the date and time of the match at www.fcbarcelona.com