I've got a SafeCracker form that contains (amongst other fields) an entry_date field and an expiration_date field:
<input type="text" name="entry_date" id="entry_date" value="{entry_date}" maxlength="23" size="25">
<input type="text" name="expiration_date" id="expiration_date" value="{expiration_date}" maxlength="23" size="25">
For this particular channel, I always want the expiration date to be exactly 24 hours after the entry date (and the user can change the entry date to be any date/time, not necessarily the current date/time). Is it possible make this happen automatically, without requiring the user to manually add/edit the expiration date?