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posixt
2000 Jul 20
4
RFC: System and time support functions in R
...not *quite* correct,
as not all days are the same length due to the (rare) use of
leap-seconds. And chron does not know about timezones.
My suggestion here is to implement a time class called POSIXtime which is
just POSIX's time_t. (Number of seconds since 1 Jan 1970.) And another time
class POSIXtm which is an R list giving a struct tm (secs, mins, hours, day
of month, month, year, day of week, day of year). (I think it also needs
to record the timezone used.) Then we can have R functions as vectorized
wrappers for the POSIX functions (not necesarily with these names)
time (say Sys.date):...