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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_TIMECONDITION
Section: 3
Source: libcurl
See-also:
- CURLINFO_FILETIME (3)
- CURLOPT_TIMEVALUE (3)
---
# NAME
CURLOPT_TIMECONDITION - select condition for a time request
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMECONDITION, long cond);
~~~
# DESCRIPTION
Pass a long as parameter. This defines how the CURLOPT_TIMEVALUE(3) time
value is treated. You can set this parameter to *CURL_TIMECOND_IFMODSINCE*
or *CURL_TIMECOND_IFUNMODSINCE*.
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. curl_easy_getinfo(3) with the *CURLINFO_CONDITION_UNMET*
option can be used after a transfer to learn if a zero-byte successful
"transfer" was due to this condition not matching.
# DEFAULT
CURL_TIMECOND_NONE (0)
# PROTOCOLS
HTTP, FTP, RTSP, and FILE
# EXAMPLE
~~~c
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);
}
}
~~~
# AVAILABILITY
Always
# RETURN VALUE
Returns CURLE_OK
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