Summer Time - Daylight Savings

The internal PVsyst meteo data - in Legal Time - does not take the "Summer Time" hour shift (also called "Daylight Savings Time") into account: the hour is related to the original Time Zone (usually "Winter Time") all over the year.

When importing meteo data, the source data could include such a shift, which has to be corrected.

The shifting dates are never fixed, but obey to rules which may be different in some regions of the world.

PVsyst proposes default settings according to the location of the geographical site :

-	Europe: the passage to summer time arises on the last Sunday of March, and to Winter time on last Sunday of October at 01:00 in the morning.

-	US: the passage to summer time arises on the second Sunday of March, and to Winter time on first Sunday of November at 02:00 in the morning.

-	Other: the passage to summer time arises on the first of March, and to Winter time on first of November at 01:00 in the morning.

The user will be invited to check/correct these dates at each conversion, as they will depend on the year.

NB: Please carefully check the results on daily plots after conversion, i.e. the shift of the hourly data with respect to the Clear Sky model !