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As defined in RFC2616, https://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3, there are three valid formats:
Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
parse_http_date(x, failure = structure(NA_real_, class = "Date"))http_date(x)
http_date(x)
A POSIXct object if succesful, otherwise failure
failure
For parse_http_date, a character vector of strings to parse. All elements must be of the same type.
parse_http_date
For http_date, a POSIXt vector.
http_date
POSIXt
What to return on failure?
parse_http_date("Sun, 06 Nov 1994 08:49:37 GMT") parse_http_date("Sunday, 06-Nov-94 08:49:37 GMT") parse_http_date("Sun Nov 6 08:49:37 1994") http_date(Sys.time())
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