I spent the last few days contemplating how to derive the exact age of the universe from the speed of light. The main problem is the large numbers. Currently, I'm stuck at the size of space time, which I figured is about 9,5 lightyears * pi squared. All I want is a date to my new holiday!
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Using c as a timestamp and converting it on-line got me Mon 02 Jul 1979 08:40:58 PM (the converter counts from 1970). So, from today on I will celebrate The Birthday Of The Universe every 9 years on the second of July.

You forgot to compensate for the gravitational effect of the inter-galactic sub-particle mass, which can change Planck's constant. If you figure that in and then perform a partial integration with respect to c I believe it comes to 9 yrs, 3 days, and 5 hrs -- give or take a few minutes.