Round time to nearest 15 minutes, half hour, or hour?

Round time to nearest 15 minutes, half hour, or hour?

Hello,

So far I'm very pleased with Zoho invoice. I freelance so most of my work is hourly. In order to make things cleaner for myself and for my clients, I was wondering if there is a way to round the time to the nearest quarter hour, half hour, or hour. So if I log 2.73 hours with the timer, it would round it to 2.75 on the invoice if I choose it to round to the nearest quarter hour, or 3.00 if I choose to round to the nearest hour, etc.

Thank you.