Replace direct calls to strftime with dformat calls

This is in preparation for fixing #3573

doku.php

@@ -79,10 +79,14 @@ if($DATE_AT) {
         $DATE_AT = null;
     } else if ($rev_t === false) { //page did not exist
         $rev_n = $pagelog->getRelativeRevision($DATE_AT,+1);
-        msg(sprintf($lang['page_nonexist_rev'],
-            strftime($conf['dformat'],$DATE_AT),
-            wl($ID, array('rev' => $rev_n)),
-            strftime($conf['dformat'],$rev_n)));
+        msg(
+            sprintf(
+                $lang['page_nonexist_rev'],
+                dformat($DATE_AT),
+                wl($ID, array('rev' => $rev_n)),
+                dformat($rev_n)
+            )
+        );
         $REV = $DATE_AT; //will result in a page not exists message
     } else {
         $REV = $rev_t;

inc/ChangeLog/ChangeLog.php

@@ -637,8 +637,8 @@ abstract class ChangeLog
             } else {
                 // $fileRev is older than $lastRev, that is erroneous/incorrect occurence.
                 $msg = "Warning: current file modification time is older than last revision date";
-                $details = 'File revision: '.$fileRev.' '.strftime("%Y-%m-%d %H:%M:%S", $fileRev)."\n"
-                          .'Last revision: '.$lastRev.' '.strftime("%Y-%m-%d %H:%M:%S", $lastRev);
+                $details = 'File revision: '.$fileRev.' '.dformat($fileRev, "%Y-%m-%d %H:%M:%S")."\n"
+                          .'Last revision: '.$lastRev.' '.dformat($lastRev, "%Y-%m-%d %H:%M:%S");
                 Logger::error($msg, $details, $this->getFilename());
                 $timestamp = false;
                 $sum = $lang['external_edit'].' ('.$lang['unknowndate'].')';

inc/common.php

@@ -1164,7 +1164,7 @@ function parsePageTemplate(&$data) {
     $tpl = preg_replace_callback(
         '/%./',
         function ($m) {
-            return strftime($m[0]);
+            return dformat(null, $m[0]);
         },
         $tpl
     );