Below is the link to CORRESPONDENCES chapter from the THE BOOK OF THOTH by Aleister Crowley, where you can find tables with correspondences between Thoth tarot cards and astrological signs and planets. Time of an event in a reading will be defined by the sign and/or it's ruling planet related to the card in question.
As a suggestion, this relationship described by Crowley is just one of the many other tarot time interpretations. You can try different systems and follow the one you feel is right.
