Bruno BoiandJulien Mougenot 0f49724436 [IMP] web: simplify format/parse/deserialize date(time) utils
The goal is to improve the dates utility functions (parse/format) by removing the timezone option, which is difficult to understand and has proven to be error prone.

- Rationale
When manipulating DateTime objects on the JS side, associated timezones
must be always coherent.
Until now, there were several code parts that had to check the DateTime
timezone and handle things differently in a case or another.
This sometimes lead to wrong code.
E.g. there was a bug in the DatePicker component because the DateTime
object it receives in props is in local timezone, but once it updates it
through the parse utility, the new object is in UTC.

- After this commit
The DateTime objects you'll get through deserialization or parsing are
always set in the user's local timezone.
The formatted strings you'll get through formatDate and formatDateTime
utils will always be expressed in the user's local timezone.
The formatted strings you'll get through serialization utils will always
be expressed in UTC.

- serializeDate and serializeDateTime
  - expected input: a DateTime object (its timezone does not matter)
  - outputs: a string formatted for the server expressed in UTC

- formatDate and formatDateTime
  - expected input: a DateTime object (its timezone does not matter)
  - outputs: a string formatted for the user, expressed in the user's TZ

- deserializeDate and deserializeDateTime
  - expected input: a date(time) string provided by the server, in UTC
  - outputs: a DateTime object in user's TZ

- parseDate and parseDateTime
  - expected input: a date(time) string provided by the user, in its TZ
  - outputs: a DateTime object in user's TZ

- Other changes in this commit
As the timezone option has been removed from parsing/formatting utils,
all their usage had been adapted in the codebase.
The large diff in dates_tests.js is because some tests were reorganized,
others were removed/adapted/joined.
A test has been removed from daterange_field_tests.js, because it has
no sense: it displays a date field as a datetime, but a date field does
not have any time information.

Part-of: odoo/odoo#98980
Co-authored-by: Julien Mougenot <jum@odoo.com>
2022-09-01 17:10:59 +02:00
2022-08-30 08:18:53 +02:00
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