is.na(strptime("19810329012000",format="%Y%m%d%H%M%S"))
[1] TRUE
The problem was to do with daylight saving time. I need to specify a time zone
as this time doesn't exist in my operating system's current time zone. I still
think this is odd behaviour though! When you look at the missing object it
doesn't look missing at all.
Caroline
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