pat_filterDate: Date filtering for _pat_ time series objects

In MazamaScience/AirSensor2: Process and Display Data from Air Quality Sensors

Date filtering for pat time series objects

Description

Subsets a pat object by date. This function always filters to day-boundaries. For sub-day filtering, use pat_filterDatetime().

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

• "YYYYmmdd"

• "YYYY-mm-dd"

Timezone determination precedence assumes that if you are passing in POSIXct values 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

Usage

pat_filterDate(
  pat = NULL,
  startdate = NULL,
  enddate = NULL,
  timezone = NULL,
  unit = "sec",
  ceilingStart = FALSE,
  ceilingEnd = FALSE
)

Arguments

pat	pat object.
startdate	Desired start datetime (ISO 8601).
enddate	Desired end datetime (ISO 8601).
timezone	Olson timezone used to interpret dates.
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 subset of the incoming pat time series object. (A list with meta and data dataframes.)

Note

The returned data will run from the beginning of startdate until the beginning of enddate – i.e. no values associated with enddate will be returned. The exception being when enddate is less than 24 hours after startdate. In that case, a single day is returned.

See Also

pat_filter

pat_filterDatetime

MazamaScience/AirSensor2 documentation built on June 1, 2025, 7:13 p.m.