The mock server's mockReadGroup function would not properly compute the
value, range and domain of the returned groups for date/datetime fields.
The value should be expressed in the local timezone,
and the range/domain shoulb be expressed in UTC timezone.
Consider the following:
- a record with a datetime field of value "2016-12-14 12:34:56" (expressed in UTC)
- a user with an UTC+2 timezone offset
- a read_group with groupby "['datetime:hour']"
The corresponding group would have had the following metadata:
- value: `"12:00 14 Dec"`
- domain: `[["datetime", ">=", "2022-12-14 11:00:00"], ["datetime", "<", "2022-12-14 12:00:00"]]`
- range: `{ from: "2022-12-14 11:00:00", to: "2022-12-14 12:00:00" }`
It now has the following valid metadata:
- value: `"13:00 14 Dec"`
- domain: `[["datetime", ">=", "2022-12-14 12:00:00"], ["datetime", "<", "2022-12-14 13:00:00"]]`
- range: `{ from: "2022-12-14 12:00:00", to: "2022-12-14 13:00:00" }`
closesodoo/odoo#96946
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>