simtimer in a little R package designed to simplify (and speeding up) calculating time intervals in discrete event simulations.
Discrete event simulations is a simulation paradigm that is based on the evaluation of events taking place in a time-specific order. Therefore a discrete event simulation calculates many time intervals. simtimer handles dates and times as integers. This makes working with time intervals as easy (and as fast) as subtracting integers.
You can install simtimer from
install.packages("simtimer") # install.packages("devtools") devtools::install_github("ims-fhs/simtimer")
Simtimer allows transformation between datetimes (POSIXt) and sim_datetimes (integer) with
origin_date <- as.POSIXct("2016-01-01 00:00:00", tz = "UTC") my_datetime <- as.POSIXct("2016-01-02 01:01:01", tz = "UTC") my_simdatetime <- as.sim_datetime(my_datetime, origin_date) my_simdatetime #>  90061
as.datetime(my_simdatetime, origin_date) #>  "2016-01-02 01:01:01 UTC"
Simtimer allows to manipulate sim_datetimes and extract parts of sim_datetimes with
sim_time(my_simdatetime) #>  3661 sim_wday(my_simdatetime, origin_date) #>  "6" sim_date(my_simdatetime) #>  1
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