fix: Incomplete date-times are encoded as iso-formatted date-time

[lucaas]

Resolves FT-7e37292d-464c-44f4-9c62-a40705f886b4

• I have added automatic tests where applicable
• The PR title is suitable as a release note
• The PR contains a description of what has been changed
• The description contains manual test instructions

Changes

Update regex to not match incomplete date-times.

Here is how copilot describes the regex:

The active selection is a regular expression in TypeScript that is used to validate date-time strings in the ISO 8601 format. > This format is widely used in web applications and APIs for transmitting date and time data.

Let's break down the regular expression:

• ^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d matches a date-time string with a year, month, day, hour, minute, and second. The T is a literal character that separates the date and time components.
• (.\d+)? matches an optional fractional second, which if present, should be a period followed by one or more digits.
• (([+-]\d\d:\d\d)|Z)?$ matches an optional timezone offset, which can be 'Z' (for UTC) or a positive or negative offset in the format HH:MM.
• The i at the end of the regular expression makes the match case-insensitive.

For more details on the format: https://www.w3.org/TR/NOTE-datetime

Test

Validate code changes.

[gismya]

It's a sensible change. My initial reaction was that this should probably wait for the V2 release because of potential unintended effects, but after reviewing the relevant code, previous implementations, and how they are reflected in the database later this should probably be fine to consider simply a bug fix.

But if we only want to pick up previous date objects that have gone through .toISOString we should lock down the regex even further.

[gismya]

After investigating it, this seems like a good level of targeting isIsoDate.