julian(m, d, y, origin = c(month = 1, day = 1, year = 1970)) month.day.year(jul, origin = c(month = 1, day = 1, year = 1970)) leap.year(y) day.of.week(month, day, year)
m
| vector of month numbers. |
d
| vector of day numbers. |
y
| vector of years. |
jul
|
vector of Julian Dates, i.e., number of days since origin .
|
origin
|
vector specifying the origin as month, day, and year. If missing,
it defaults to options(chron.origin) if this is non-null,
otherwise c(month = 1, day = 1, year = 1970) .
|
origin
) when
julian()
is called, or a list with members month
,
day
, year
corresponding to the input Julian dates if
month.day.year()
is called. leap.year()
returns a
logical vector indicating whether the corresponding year is a leap
year.
day.of.week()
returns a number between 0 and 6 to specify day
of the weekל refers to Sunday.
These functions were taken from Becker, Chambers, and Wilks (1988),
and were slightly modified to take chron
and dates
objects; some also take the extra argument origin
.
chron
,
dates
,
times
julian(1, 1, 1970) # [1] 0 unlist(month.day.year(0)) # month day year # 1 1 1970