is_date_proper: Check date format
Description
Check date input strings conform to the required format.
Usage
is_date_proper(instr = NULL, format = "%Y-%m-%d")
Value
No returning value. It stops the function if instr
doesn't
conform to the format
.
Arguments
- instr
character(1). String to check.
- format
character(1). Matching format to be checked.
Default is "%Y-%m-%d"
, which can detect "%Y/%m/%d
.
See strftime
for details of formatting this string.