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...ies at gartner.com <mailto:vertical.industries at gartner.com> or phone: 203 316 1122 Come see us at: Gartner''s Healthcare Summit 2008 Nov. 16 - 19, 2008 at the San Diego Sheraton Hotel and Marina "Invention is the mother of necessity." Thorstein Veblen This e-mail message, including any attachments, is for the sole use of the person to whom it has been sent, and may contain information that is confidential or legally protected. If you are not the intended recipient or have received this message in error, you are not authorized to copy,...

...POSIXct(strptime("1969-12-31 23:59:59","%Y-%m-%d %H:%M:%S"))) POSIXct[1:1], format: NA According to ?strptime NA should be returned if the time doesn't exist. As far as I can tell, 1969-12-31 23:59:59 does exists. Using a simple C program (source follows this message): [veblen:~/Rforge/xts] jryan% ./a.out Date as tm struct (POSIXlt):1969-12-31 23:59:59 sec: 59 min: 59 hour: 23 mday: 31 mon: 11 year: 69 wday: 3 yday: 364 seconds since the Epoch: -1 Which gives the -1. This is all run on a Intel Mac, though has been tested on FreeBSD and Ubuntu as well...