I’ve seen so many different standards for the JSON date format:
Which one is the right one? Or best? Is there any sort of standard on this?
It’s human readable but also succinct
It sorts correctly
It includes fractional seconds, which can help re-establish chronology
It conforms to ISO 8601
ISO 8601 has been well-established internationally for more than a decade
That being said, every date library ever written can understand “milliseconds since 1970”. So for easy portability, ThiefMaster is right.