piwigo version ?
plugins activated ?
personal template-extensions ?
link ?

I recently installed version 2.0.6
no plugins
happens with all templates
www.thekeatsmap.com/smile

thanks for your help!

ok, I'll try changing the date and get back to you. Thanks!

00 0000

1 - Admin > Specials > Plugins

Activate : LocalFiles Editor

2 - Admin > Specials > Plugins > LocalFiles Editor

Config tab (default and first one)

And code it like this:

<?php
$conf['use_iptc'] = true;
$conf['use_iptc_mapping'] = array(
  'keywords'        => '2#025',
  'author'          => '2#122',
  'name'            => '2#005',
  'comment'         => '2#120'
  );
$conf['use_exif'] = true;
$conf['use_exif_mapping'] = array(
  'date_creation' => 'DateTimeOriginal'
  );
?>

Save

3 - Admin > Categories > Synchronize

Select all of:
synchronize files structure with database
nothing
synchronize files metadata with database elements informations...
even already synchronized elements
overrides existing values with empty ones

UNSELECT
only perform a simulation (no change in database will be made)

Submit





It should be resolved.
This is due to empty dates in ITPC and default values in synchronization parameters.
Default is:
$conf['use_iptc_mapping'] = array(
  'keywords'        => '2#025',
  'date_creation'   => '2#055',
  'author'          => '2#122',
  'name'            => '2#005',
  'comment'         => '2#120'
  );
date_creation should be provided by EXIF not IPTC.