Helper for preparing a Date or POSIXct column for use with
add_slider_control(). Because sf objects are serialized to
GeoJSON as JSON strings for date/time columns, the slider needs a
numeric counterpart to filter on.
Usage
as_time_property(x, unit = c("year", "month", "day", "date", "seconds"))
Arguments
- x
A Date, POSIXct, or numeric vector.
- unit
One of:
"year" — calendar year as integer (e.g. 2026).
"month" — zero-based month index (0 = January).
"day" — day of month.
"date" — days since 1970-01-01.
"seconds" — seconds since the Unix epoch.
Value
An integer or numeric vector appropriate for attaching to an
sf object as a new column before calling
add_slider_control().
Examples
dates <- as.Date(c("2015-01-15", "2015-06-30", "2015-12-31"))
as_time_property(dates, "month")
#> [1] 0 5 11
as_time_property(dates, "year")
#> [1] 2015 2015 2015
as_time_property(dates, "date")
#> [1] 16450 16616 16800
