Single Timer (clock) for Login members

Hello everyone, I have a new challenge, oh yes!

I am working on a prayer project. The owner of the site wants a timer that ONLY login members can enter their hours, and show them how many hours they have accumulated in prayer. It needs to be a single timer for everyone, so it will show the amount of prayers all have done, but it would be nice to show also their amount of prayer individually.

I cannot imagine what program to use to do that. RRR

Any ideas?

Thanks,