Datetime filtering for PurpleAir Timeseries objects

Source: R/pat_filterDatetime.R

Subsets a PurpleAir Timeseries object by datetime. This function allows for sub-day filtering as opposed to pat_filterDate() which always filters to day-boundaries.

Datetimes can be anything that is understood by MazamaCoreUtils::parseDatetime(). For non-POSIXct values, the recommended format is "YYYY-mm-dd HH:MM:SS".

Timezone determination precedence assumes that if you are passing in POSIXct times then you know what you are doing.

  1. get timezone from startdate if it is POSIXct

  2. use passed in timezone

  3. get timezone from pat

pat_filterDatetime(
  pat = NULL,
  startdate = NULL,
  enddate = NULL,
  timezone = NULL
)

Arguments

pat

PurpleAir Timeseries pat object.

startdate

Desired start datetime (ISO 8601) or POSIXct.

enddate

Desired end datetime (ISO 8601) or POSIXct.

timezone

Olson timezone used to interpret dates.

Value

A subset of the given pat object.

Examples

library(AirSensor)

example_pat %>%
  pat_filterDatetime(
    startdate = "2022-07-02 06:00:00", 
    enddate = "2022-07-05 18:00:00"
  ) %>%
  pat_multiPlot()