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RFC 5545, "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", September 2009

Source of RFC: calsify (app)

Errata ID: 5082

Status: Reported
Type: Technical

Reported By: George Sexton
Date Reported: 2017-08-10

Section 3.8.7.3 says:

N/A

It should say:

The value must not be in the future.

Notes:

If future values are allowed for LAST-MODIFIED, it makes it very difficult for software to perform change management for a VEVENT.

Say for example, an event is imported from a source and the VEVENT has a future date. For example, December 20 2017 12:00:00Z

That event is then edited and assigned the actual correct date and time. Say August 9 2017 13:45:44Z.

Software that examines the VEVENT's LAST-MODIFIED to determine if the VEVENT record has been modified will not see the VEVENT is updated.

In order for different systems to perform change management, the value for LAST-MODIFIED should NEVER be a future date.

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