ZOHO Books Timesheet and rounding time/hours

ZOHO Books Timesheet and rounding time/hours

I read an old thread in the Zoho Invoice forums about rounding to nearest 15 or 30 minutes for Timesheet entries.  Is this possible in Books?? I'd think it would be since isn't Invoice just a stripped down version of Books?

So my question: Is it possible to ROUND to nearest 15 min or 30 min, etc for timesheet entries? 

thanks!