2.2.30 [RFC5545] Section 3.3.4, Date

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V0038:

The specification describes the DATE data type.

Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019  

On import, Outlook parses any valid value in DATE or DATE-TIME format, as specified in [RFC5545]. Outlook attempts to approximate the value of invalid DATE or DATE-TIME values. If it cannot approximate the value, then it ignores the property.

Outlook treats any date before January 1, 1601, and any date after December 31, 4500, as invalid.