Thanks a lot yahootex3000.

I was looking at the DLS conditions.

Things become a bit more complicated if we live in Europe, since we too have a DLS period… but not exactly on the same period as USA !

In Europe, DLS time begins on the last Sunday of March, and ends on the last Sunday of October.

As a consequence, during 2 short periods, in March (from the 2nd Sunday to the last Sunday) and in October/November (from the las Sunday of October to the 1st Sunday of November), the time difference is only 5 hrs, while it is 6 hrs during the other part of the year. I  am trying to solve the equation !