easy:SetOpt_TimeCondition(cond)
#CURLOPT_TIMEVALUE
time
value is treated. You can get 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 will have no effect even if the given time condition would not
have been met. easy:GetInfo() 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.