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* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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CURLOPT_TIMEVALUE - set time value for conditional #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMEVALUE, long val); Pass a long val as parameter. This should be the time counted as seconds since 1 Jan 1970, and the time will be used in a condition as specified with CURLOPT_TIMECONDITION(3). On systems with 32 bit 'long' variables, this option cannot set dates beyond the year 2038. Consider CURLOPT_TIMEVALUE_LARGE(3) instead. 0 HTTP, FTP, RTSP, and FILE

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, CURL_TIMECOND_IFMODSINCE);

 /* Perform the request */
 curl_easy_perform(curl);
}

Always Returns CURLE_OK CURLOPT_TIMECONDITION "(3), "