Get the overall date range for a set of files

What are the start and end date of your study? This function takes in a vector of file names, and export a character string indicating the date range of your study.

Usage

get_date_range(file_names)

Arguments

file_names

What are the path to all the data files that you wish to process? This should be a character vector of file names.

Value

A single character string in one of the following format:

"YYMMDD"

when all dates in df$date are the same

"YYMMDD_YYMMDD"

otherwise, concatenation of start and end dates

Returns NA_character_ (with a warning) if df has zero rows.

Examples

get_date_range(c("feed/VR200720.DAT", "feed/VR200715.DAT", "feed/VR200716.DAT"))
#> [1] "200715_200720"