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curl/docs/cmdline-opts/time-cond.d

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+Long: time-cond
+Short: z
+Arg: <time>
+Help: Transfer based on a time condition
+Protocols: HTTP FTP
+Category: http ftp
+---
+Request a file that has been modified later than the given time and date, or
+one that has been modified before that time. The <date expression> can be all
+sorts of date strings or if it doesn't match any internal ones, it is taken as
+a filename and tries to get the modification date (mtime) from <file>
+instead. See the \fIcurl_getdate(3)\fP man pages for date expression details.
+
+Start the date expression with a dash (-) to make it request for a document
+that is older than the given date/time, default is a document that is newer
+than the specified date/time.
+
+If this option is used several times, the last one will be used.