Hi Experts, I have a problem in Dates. I have a zoo object called 'intra'. And the class of index(intra) is ("Chron" "Dates" "Time"). I need to put the index of this zoo object into a data frame. So I used, idat<-data.frame(Datetime=as.POSIXlt(index(intra),"GMT")) But I get the values of 'idat' to be: "01joulu2006 09:59:59" "01joulu2006 10:09:59" "01joulu2006 10:19:59" "01joulu2006 10:30:00" "01joulu2006 10:40:00" "01joulu2006 10:50:00" But I need the 'idat' format to be: 2006-12-01 13:30:00 2006-12-01 13:40:00 2006-12-01 13:50:00 2006-12-01 14:00:00 2006-12-01 14:10:00 2006-12-01 14:19:59 2006-12-01 14:29:59 i.e., instead of joulu (The finnish version of December) I need to get in the number format. How do I do this? Do I need to change the OS date format? Because I read a documentation which says "Unfortunately, the documentation of POSIXt objects is Operating system dependent and especially under MS Windows several problems appear in the management of time zones and day light saving times" (Source: R Documentation, timeDate Class). Thought this may help you... Thank you, Shubha. [[alternative HTML version deleted]]