Handling Timezones in cakephp

I have added a timezone field on user sign up page.Now when a tutor
logins then he will fill his timezone and will also fill his
availability(timinings he will be available in a week)
Now there is a functionality of FINDING A TUTOR .Any 1 ho wishes to
search a tutor will enter start date start time end date end time.Now
how should I handle this task???what conditions am I supposed to
give...Any responses will be appreciated.Thanks In advance.

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