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The server MUST ensure that a "DTSTAMP" iCalendar property is present and set the value to the UTC time that the scheduling message was generated (as required by iCalendar).
The server MUST ensure that for each type of scheduling operation, the "SEQUENCE" iCalendar property value is updated as per iTIP [RFC5546].
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The iCalendar Validator provides developers and testers a method to validate their iCalendar feeds, which can take data from either a URL, file or text snippet and compare it against the RFC 5545 specification. We believe we have one of the best iCalendar validation tools available on the internet. More information about the validator can be found here.