SpaDES modules commonly use approximate durations that divide with no
remainder among themselves.
For example, models that simulate based on a "week" timestep, will likely
want to fall in lock step with a second module that is a "year" timestep.
Since, weeks, months, years don't really have this behaviour because of:
leap years, leap seconds, not quite 52 weeks in a year, months that are of
different duration, etc.
We have generated a set of units that work well together that are based on
the astronomical or "Julian" year.
In an astronomical year, leap years are added within each year with an extra
1/4 day, (i.e., 1 year == 365.25 days); months are defined as year/12, and
weeks as year/52.
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numeric. Number of the desired units
When these units are not correct, a module developer can create their own
time unit using, and create a function to calculate the number of seconds
in that unit using the "d" prefix (for duration), following the
lubridate package standard:
dfortNight <- function(x) lubridate::duration(dday(14)).
Then the module developer can use "fortNight" as the module's time unit.
Number of seconds within each unit
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