Format: YYYY-MM-DDThh:mm:ss
Specifies an ISO 8601 local date time agnostic of timezone. T serves as a static delimiter for the date part and the time part.
Ref: https://en.wikipedia.org/wiki/ISO_8601
Format: milliseconds since epoch (1970-01-01T00:00:00)
Specifies an instance in time which is futher in time by the milliseconds value from epoch (1970-01-01T00:00:00).