Create a POSIXct time range — timeRange • MazamaCoreUtils

Uses incoming parameters to return a pair of POSIXct times in the proper order. Both start and end times will have lubridate::floor_date() applied to get the nearest unit. This can be modified by specifying ceilingStart = TRUE or ceilingEnd = TRUE in which case lubridate::ceiling_date() will be applied.

The required timezone parameter must be one of those found in OlsonNames.

Dates can be anything that is understood by lubrdiate::parse_date_time() including either of the following recommended formats:

"YYYYmmddHH[MMSS]"
"YYYY-mm-dd HH:MM:SS"

timeRange(
  starttime = NULL,
  endtime = NULL,
  timezone = NULL,
  unit = "sec",
  ceilingStart = FALSE,
  ceilingEnd = FALSE
)

Arguments

starttime: Desired start datetime (ISO 8601).
endtime: Desired end datetime (ISO 8601).
timezone: Olson timezone used to interpret dates (required).
unit: Units used to determine time at end-of-day.
ceilingStart: Logical instruction to apply ceiling_date to the startdate rather than floor_date
ceilingEnd: Logical instruction to apply ceiling_date to the enddate rather than floor_date

Value

A vector of two POSIXcts.

POSIXct inputs

When startdate or enddate are already POSIXct values, they are converted to the timezone specified by timezone without altering the physical instant in time the input represents. This is different from the behavior of parse_date_time (which powers this function), which will force POSIXct inputs into a new timezone, altering the physical moment of time the input represents.

Examples

library(MazamaCoreUtils)

timeRange("2019-01-08 10:12:15", 20190109102030, timezone = "UTC")
#> [1] "2019-01-08 10:12:15 UTC" "2019-01-09 10:20:30 UTC"