The cases lookup for "אברהם מוסטקי" was still failing after the
Case.number fix, with a new exception:
JsonException at $.list[0].createdAt
The JSON value is not in a supported DateTimeOffset format.
EspoCRM serializes datetimes as "2024-01-15 14:30:00" without a timezone
designator, but .NET's built-in DateTimeOffset reader only accepts
strict ISO 8601 with a tz suffix. Adding the FlexibleStringConverter
to CreatedAt is not enough since the target type is DateTimeOffset, not
string.
Solution: a dedicated FlexibleDateTimeOffsetConverter that:
- Accepts ISO 8601 with offset (fast path)
- Accepts "YYYY-MM-DD HH:mm:ss" / "YYYY-MM-DD" / variants, treating
them as UTC
- Accepts Unix epoch numbers
- Accepts null / empty strings
Registered globally on the JsonOptions used by EspoCrmClient, so every
model that exposes a DateTimeOffset? deserializes correctly without
per-property attributes.
Tests: 39 passing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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