How to retrieve extended properties of type datetime? - microsoft-graph-api

Question

As a followup to How to retrieve extended properties for calendar event (by name)?: I can retrieve integer and string values with the singleValueExtendedProperties expansion, but how to retrieve dateTime values?
This fails ({{ }} are Postman variables):
https://graph.microsoft.com/v1.0/users/{{UserID}}/calendar/events/{{TTSyncedEventID}}?$expand=singleValueExtendedProperties($filter=id eq 'dateTime {00020329-0000-0000-C000-000000000046} Name TTSyncTime')
...with a not very helpful response:
{
"error": {
"code": "ErrorInvalidProperty",
"message": "PropertyId values may only be in one of the following formats: 'MapiPropertyType namespaceGuid Name propertyName', 'MapiPropertyType namespaceGuid Id propertyId' or 'MapiPropertyType propertyTag'."
}
}
I have tried several variations on date(Time) but without success...

Answer 1

Found it thanks to Vicky's comments.
These datetime properties were created with EWS in the same manner as the integer/string values described in the earlier SO question.
That code contains PropertyType="SystemTime", and that is exactly what I need to use:
<typ:SetItemField>
<typ:ExtendedFieldURI DistinguishedPropertySetId="PublicStrings" PropertyName="TTSyncTime" PropertyType="SystemTime"/>
<typ:CalendarItem>
<typ:ExtendedProperty>
<typ:ExtendedFieldURI DistinguishedPropertySetId="PublicStrings" PropertyName="TTSyncTime" PropertyType="SystemTime"/>
<typ:Value>UTCString</typ:Value>
</typ:ExtendedProperty>
</typ:CalendarItem>
</typ:SetItemField>
So the proper query becomes:
https://graph.microsoft.com/v1.0/users/{{UserID}}/calendar/events/{{TTSyncedEventID}}?$expand=singleValueExtendedProperties($filter=id eq 'SystemTime {{PS_PUBLIC_STRINGS_NameSpace}} Name TTSyncTime')
({{ }} are Postman variables)

Answer 2

As per the doc ,there is already start/dateTime property outside of singleValueExtendedProperties , so you can directly call the API - https://graph.microsoft.com/v1.0/me/calendar/events?$filter=start/dateTime eq '2022-12-28T12:30:00Z'