add datetime validation for collection time intervals

[vincentsarago]

closes #176

Q: should we validate interval values themself? (e.g [0] < [1] and sub-intervals)

[gadomski]

Q: should we validate interval values themself? (e.g [0] < [1] and sub-intervals)

My instinct is yes? One of the values of stac-pydantic over pure json-schema is the ability to easily do checks like this.

[vincentsarago]

moved ☝️ to shared

[vincentsarago]

@gadomski
I'm trying to understand the spec here but looking at the json-schema I feel ☝️ respect the specification

• interval HAS TO be an array of at least 1 item [[]]
• interval items HAVE to be an array or 2 Datetime|None value [[date, None], ...]

# previous
TimeInterval(interval=[])  # OK
TimeInterval(interval=[[]])  # OK
TimeInterval(interval=[['yo']])  # OK

# now

TimeInterval(interval=[])
ValidationError: 1 validation error for TimeInterval
interval
  List should have at least 1 item after validation, not 0 [type=too_short, input_value=[], input_type=list]
    For further information visit https://errors.pydantic.dev/2.11/v/too_short

TimeInterval(interval=[[]])
ValidationError: 1 validation error for TimeInterval
interval.0
  List should have at least 2 items after validation, not 0 [type=too_short, input_value=[], input_type=list]
    For further information visit https://errors.pydantic.dev/2.11/v/too_short

TimeInterval(interval=[['yo']])
ValidationError: 1 validation error for TimeInterval
interval.0.0
  Input should be a valid datetime or date, input is too short [type=datetime_from_date_parsing, input_value='yo', input_type=str]
    For further information visit https://errors.pydantic.dev/2.11/v/datetime_from_date_parsing

👇 https://github.com/radiantearth/stac-spec/blob/v1.0.0/collection-spec/json-schema/collection.json#extent-object

cc @alinbutu

[vincentsarago]

I've just tried pystac validation and new behaviour seems 👍

[vincentsarago]

for some reason Mypy doesn't like conlist=