c’est bien le timezone Europe/Paris qui mettait le bazar,
avec Europe/Berlin c’est ok, et au passage les warnning php date.timezone() on disparurent des log.
[20-Nov-2017 11:55:55 Europe/Berlin] PHP Warning: date() [function.date]: It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected ‹ Europe/Berlin › for ‹ CET/1.0/no DST › instead in /ecrire/inc/filtres.php on line 766