Perhaps I'm missing a real, stupid point but I can't understand the following behaviour: > strptime("30 march 2008 02:30 AM",format="%d %B %Y %I:%M %p") [1] "2008-03-30 02:30:00" > strptime("30 march 2008 00:30 AM",format="%d %B %Y %I:%M %p") [1] NA Why times 00:nn are not available and how solve this? Ciao Vittorio