2.2.31 [RFC5545] Section 3.3.5, Date-Time


The specification describes the DATE-TIME data type.

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

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.


The specification states that a time value MUST ONLY specify 60 seconds when specifying the periodic "leap second" in the time value.

Office Outlook 2007, Outlook 2010, Outlook 2013, Outlook 2016

Outlook does not support "leap seconds." A value of 60 seconds is approximated as 59 seconds.