I had very strange problem today morning with convetion string to date. I’ve spent about 2 ours before I found what was a problem. The problem became apparent because we put a clock one hour back. But our DateTime module uses difference between local time and G.M.T. So, for all dates which are creater than 31/10/04 it works correct, but for other it returns wrong date (minus one day). So, I needed to find formula to calculate period of Daylight Saving Time and I found quite good resource – Daylight Saving Time. You can read there about history of Daylight Saving Time, its utility and etc.
