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        !            23: .TH CURLOPT_TIMECONDITION 3 "April 03, 2016" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_TIMECONDITION \- select condition for a time request
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMECONDITION, long cond);
        !            31: .SH DESCRIPTION
        !            32: Pass a long as parameter. This defines how the \fICURLOPT_TIMEVALUE(3)\fP time
        !            33: value is treated. You can set this parameter to \fICURL_TIMECOND_IFMODSINCE\fP
        !            34: or \fICURL_TIMECOND_IFUNMODSINCE\fP.
        !            35: 
        !            36: The last modification time of a file is not always known and in such instances
        !            37: this feature will have no effect even if the given time condition would not
        !            38: have been met. \fIcurl_easy_getinfo(3)\fP with the
        !            39: \fICURLINFO_CONDITION_UNMET\fP option can be used after a transfer to learn if
        !            40: a zero-byte successful "transfer" was due to this condition not matching.
        !            41: .SH DEFAULT
        !            42: CURL_TIMECOND_NONE (0)
        !            43: .SH PROTOCOLS
        !            44: HTTP, FTP, RTSP, and FILE
        !            45: .SH EXAMPLE
        !            46: .nf
        !            47: CURL *curl = curl_easy_init();
        !            48: if(curl) {
        !            49:   curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
        !            50: 
        !            51:   /* January 1, 2020 is 1577833200 */
        !            52:   curl_easy_setopt(curl, CURLOPT_TIMEVALUE, 1577833200L);
        !            53: 
        !            54:   /* If-Modified-Since the above time stamp */
        !            55:   curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
        !            56: 
        !            57:   /* Perform the request */
        !            58:   curl_easy_perform(curl);
        !            59: }
        !            60: .fi
        !            61: .SH AVAILABILITY
        !            62: Always
        !            63: .SH RETURN VALUE
        !            64: Returns CURLE_OK
        !            65: .SH "SEE ALSO"
        !            66: .BR CURLOPT_TIMEVALUE "(3), "