In the change 6ba81c99 there was an issue with timezone with Google
because we were now sending "20201217T123000+0000" instead of
"20201217T123124Z".
When google received formatted date ending in Z it would treat it as
UTC, but with +0000 ending he treats it as a locale time thus get it
wrong if locale timezone is different than UTC.
opw-2370895
closes#62943closesodoo/odoo#62970
X-original-commit: b68ca9fb1d3f8c0a6346fa1d3d6cce28f4977bbd
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>