MDD

In my case that was .htaccess rewrite rule. Before php 5.2.3 everything was working OK. After host upgrade timestamp posting did not work anymore.

I have rule to force users to main index page

RewriteBase /
RewriteCond %{HTTP_HOST} ^domainname.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.domainame.com$
RewriteCond %{HTTP_REFERER} !^https://domainname.com/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^https://domainname.com $      [NC]
RewriteCond %{HTTP_REFERER} !^https://www.domainname.com/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^https://www.domainname.com $      [NC]
RewriteRule .*\.(html|php)$ https://domainname.com/index.phtml [R,NC]

After excluding from this rule my host IP (IP in example is 000.000.000.000) WordPress start publishing scheduled articles again.

RewriteBase /
RewriteCond %{HTTP_HOST} ^domainname.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.domainame.com$
RewriteCond %{HTTP_REFERER} !^https://domainname.com/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^https://domainname.com $      [NC]
RewriteCond %{HTTP_REFERER} !^https://www.domainname.com/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^https://www.domainname.com $      [NC]
RewriteCond %{REMOTE_ADDR} !^000.000.000.000$
RewriteRule .*\.(html|php)$ https://domainname.com/index.htm [R,NC]

Something inside new php is different or my host makes some changes to server.

Anyway in my case problem resolved

Try this. Get your original gettext.php file, then find entry:

if ($magic == ($MAGIC1 & 0xFFFFFFFF)) { // to make sure it works for 64-bit platforms
$this->BYTEORDER = 0;
} elseif ($magic == ($MAGIC2 & 0xFFFFFFFF)) {

Replace by:

if ($magic == $MAGIC1) {
$this->BYTEORDER = 0;
} elseif ($magic == $MAGIC2) {

The solution was described there: https://wordpress.dk/forum/topic/19

It is working for me. WordPress 2.1.3 php 5.2.1

You can try to edit gettext.php file from wp-includes directory.

Find entry:

if ($magic == ($MAGIC1 & 0xFFFFFFFF)) { // to make sure it works for 64-bit platforms
$this->BYTEORDER = 0;
} elseif ($magic == ($MAGIC2 & 0xFFFFFFFF)) {

Replace by:

if ($magic == $MAGIC1) {
$this->BYTEORDER = 0;
} elseif ($magic == $MAGIC2) {

The solution was described there: https://wordpress.dk/forum/topic/19

It is working for me. WordPress 2.1.3 php 5.2.1
This was some problem with bug in php 5 corected by this file and then upgrade on server side to php 5.2.1.

php 5.0 bug was corrected be entry in gettext.php file (wp-includes). This correction does not work with php 5.2.1

You need to edit gettext.php file

Find entry:

if ($magic == ($MAGIC1 & 0xFFFFFFFF)) { // to make sure it works for 64-bit platforms
$this->BYTEORDER = 0;
} elseif ($magic == ($MAGIC2 & 0xFFFFFFFF)) {

Replace by:

if ($magic == $MAGIC1) {
$this->BYTEORDER = 0;
} elseif ($magic == $MAGIC2) {

The solution was described there: https://wordpress.dk/forum/topic/19

It is working for me. WordPress 2.1.3 php 5.2.1

Yes it is a bug in php 5.0. Was corrected be entry in gettext.php file (wp-includes). Thisc correction does not work with php 5.2.1

You need to edit gettext.php file

Find entry:

if ($magic == ($MAGIC1 & 0xFFFFFFFF)) { // to make sure it works for 64-bit platforms
$this->BYTEORDER = 0;
} elseif ($magic == ($MAGIC2 & 0xFFFFFFFF)) {

Replace by:

if ($magic == $MAGIC1) {
$this->BYTEORDER = 0;
} elseif ($magic == $MAGIC2) {

The solution was described there: https://wordpress.dk/forum/topic/19

It is working for me. WordPress 2.1.3 php 5.2.1