PLONE_CEILING for date fields

Hi,

In plone.app.form.widgets datecomponents.py and Products.CMFPlone's
date_components_support.py, we have :

# from CMFDefault.DublinCore
CEILING = DateTime(9999, 0)
FLOOR = DateTime(1970, 0)
PLONE_CEILING = DateTime(2021, 0)  # 2020-12-31

And later :

# Anything above PLONE_CEILING should be PLONE_CEILING
if date.greaterThan(PLONE_CEILING):
    date = PLONE_CEILING

The resulting issue is as follows : in our Plone site, we have some
dates which are greater than 2021. In view, the date
is correct but in edit mode, it is changed to 12/31/2020 by Plone.

In Products.CMFDefault's DublinCore.py, the only "ceiling" that I found
is : __CEILING_DATE = DateTime( 2500, 0 ) on line 304.

Does anyone know why we have this ceiling ? Should we change
it to 2500 in Products.CMFPlone and plone.app.form ?

Thanks,

Cédric

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