Before this commit, absolute notation was not supported. weekday, yearday and nlyearday were not supported either. Some other computations did not work, or weren't tested for. This commit re-introduce the support for all those features. closes odoo/odoo#77851 X-original-commit: c423326a97060fb9132abcaf997ffba41a63b5fe Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com> Signed-off-by: Géry Debongnie (ged) <ged@openerp.com>