Bug#968922: wiki.debian.org: When editing a wiki.debian.org page the date for the warning (shown on top of the page) of others that the page is being edited is incorrect.

Package: wiki.debian.org
Severity: normal

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
When editing a wiki page at https://wiki.debian.org/ the date for the warning (shown on top of the page) of others that the page is being edited is incorrect: it shows the day
before the date of the actual edit.
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
I saved the changes locally on my pc in an editor to avoid loss of data.

-- System Information:
Debian Release: 9.13
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable')
Architecture: i386 (i686)

Kernel: Linux 4.9.0-13-686 (SMP w/1 CPU core)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)