utcal.nc {RNetCDF} | R Documentation |
Convert temporal amounts to UTC referenced date and time.
utcal.nc(unitstring, value, type="n")
unitstring |
A temporal unit with an origin (e.g., ``days since 1900-01-01''). |
value |
An amount (quantity) of the given temporal unit. |
type |
Character string which determines the output type. Can be either n for numeric or s for output in string form. |
Converts the amount, value
, of the temporal unit, unitstring
, into a UTC-referenced date and time.
The udunits package uses a mixed Gregorian/Julian calendar system. Dates prior to 1582-10-15 are assumed to use the Julian calendar, which was introduced by Julius Caesar in 46 BCE and is based on a year that is exactly 365.25 days long. Dates on and after 1582-10-15 are assumed to use the Gregorian calendar, which was introduced on that date and is based on a year that is exactly 365.2425 days long. (A year is actually approximately 365.242198781 days long.) Seemingly strange behavior of the udunits package can result if a user-given time interval includes the changeover date.
If the output type is set to numeric, a matrix containing the corresponding date(s) and time(s), with the following columns: year, month, day, hour, minute, second. Otherwise a vector of strings in the form "YYYY-MM-DD hh:mm:ss"
.
Pavel Michna
http://www.unidata.ucar.edu/packages/udunits/
## Convert units to UTC referenced time utcal.nc("hours since 1900-01-01 00:00:00 +01:00", c(0:5)) utcal.nc("hours since 1900-01-01 00:00:00 +01:00", c(0:5), type="s")