[Rd] Basic date time arithmetics operations
Fan
xiao.gang.fan1 at libertysurf.fr
Sun Apr 27 19:14:28 MEST 2003
Hello,
For basic date time arithmetics operations, AFAK, there're
actually the function difftime() and the (dt + num) operations.
I'm wondering if other basic operations exist, like
add(dt, num, unit) where unit would be "y", "q", "m", etc.
Also for the function seq.dates (or seq.POSIXt), the
case for by="months" would be more useful if it takes
the situation of the end of month into account.
For example,
> seq(ISOdate(2002,1,31), by="months", length=3)
"2002-01-31 13:00:00 CET"
"2002-03-03 13:00:00 CET"
"2002-03-31 13:00:00 CET"
rather than
"2002-01-31 13:00:00 CET"
"2002-02-28 13:00:00 CET"
"2002-03-31 13:00:00 CET"
Thanks
--
Fan
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