Before this commit, user could not selecta a date before year 1900. This was an historical limitation due to python < 3.2 that didn't support dates before 1900. After this commit, user can select any date, user can select any date from 01/01/0001. taskID: 2166761 Fixes #41788 Closes #43055 closes odoo/odoo#51406 Signed-off-by: Géry Debongnie (ged) <ged@openerp.com> Co-authored-by: Mohammed Shekha <msh@odoo.com> Co-authored-by: Aaron Bohy <aab@odoo.com>