.\" generated by cd2nroff 0.1 from CURLOPT_TIMECONDITION.md
.TH CURLOPT_TIMECONDITION 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_TIMECONDITION \- select condition for a time request
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMECONDITION, long cond);
.fi
.SH DESCRIPTION
Pass a long as parameter. This defines how the \fICURLOPT_TIMEVALUE(3)\fP time
value is treated. You can set this parameter to \fICURL_TIMECOND_IFMODSINCE\fP
or \fICURL_TIMECOND_IFUNMODSINCE\fP.

The last modification time of a file is not always known and in such instances
this feature has no effect even if the given time condition would not have
been met. \fIcurl_easy_getinfo(3)\fP with the \fICURLINFO_CONDITION_UNMET\fP
option can be used after a transfer to learn if a zero\-byte successful
\&"transfer" was due to this condition not matching.
.SH DEFAULT
CURL_TIMECOND_NONE (0)
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    /* January 1, 2020 is 1577833200 */
    curl_easy_setopt(curl, CURLOPT_TIMEVALUE, 1577833200L);

    /* If-Modified-Since the above time stamp */
    curl_easy_setopt(curl, CURLOPT_TIMECONDITION,
                     (long)CURL_TIMECOND_IFMODSINCE);

    /* Perform the request */
    curl_easy_perform(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.1
.SH RETURN VALUE
Returns CURLE_OK
.SH SEE ALSO
.BR CURLINFO_FILETIME (3),
.BR CURLOPT_TIMEVALUE (3)