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How does MemoToo know what have just changed compared to new ones?

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Oddity8

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Posted 2011-02-01 - 16:30 Subject: Re: How does MemoToo know what have just changed compared to new ones?

Hi Ian,

To my knowledge calendar events are synchronization by sending the event data in ICS format. (see http://www.ietf.org/rfc/rfc2445.txt for the specification)
According to paragraph 4.8.7.3 ("Last Modified") in this specification a field is added to the actual event data which holds the date and time the event was last updated/modified locally.
So Outlook would keep it's own "last modified" date and time, and so would Memotoo, or e.g. a sync plugin for a mobile phone. When synchronizing the timestamps from the server (Memotoo) and the client (e.g. Outlook) for a specific event are compared. The event with the yougest or latest timestamp is considered the most up-to-date.

Example:
- Event A is synchronized for the first time from Memotoo to Outlook.
- On Memotoo event A is changed, so the "last modified" timestamp is updated.
- During synchronization the timestamp from Memotoo is newer than the timestamp from Outlook
--> so event A from Memotoo overwrites the older event A in outlook.
- Now in Outlook event A is updated (e.g. location is changed), and Outlook updates the timestamp
- During synchronization now Outlook has a newer timestamp for event A than Memotoo does
--> so event A is now copied in the other direction, overwriting the one in Memotoo with the one from Outlook

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