In order to keep track of the various projects, I use an Excel spreadsheet. This calculates project hours, rates etc.
The spreadsheet breaks each day down into 30 minute blocks, into which I paste a coloured block and code – which helps calculate the running totals.
As well as being useful – it also generated this bonus visualisation!
I started this in Oct 2013 – So now, I present, my work diary from Oct 2013 – Dec 2014.