Difference between "s" and "u"

Hi, What is the difference between 1:00u and 1:00s? Can anyone explain than? Is any documentation available? # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule EU 1977 1980 - Apr Sun>=1 1:00u 1:00 S # W-Eur differs from EU only in that W-Eur uses standard time. Rule W-Eur 1977 1980 - Apr Sun>=1 1:00s 1:00 S -- Grüße/Regards, Christian Sakowski christian@christiansakowski.de http://www.familiesakowski.de/ iChat/AIM: SakowskiF