Re: iCal-Basic - draft 00

Am Samstag, 8. Januar 2005 18:39 schrieb Doug Royer:
> I know that there was a large debate on having both DURATION
> and DTEND years ago that resulted in 2445. Now that we are trying
> to simplify down to  the basics. Can we pick just one?
>
>  DTSTART and optionally DURATION (no  DTEND in spec)
> or
>  DTSTART and optionally DTEND. (no DURATION in spec)

There's a small difference between these two. They are identical most of the 
time, except for those two times a year when DST switches occur. If you have 
a recurring event that falls on these switch times, you can easily see the 
difference:

1) You have nightshifts from 22:00 until 06:00 every day, so when the DST 
switch happens, your nightshift will be one hour longer/shorter than the 
usual 8 hours. => DTSTART and DTEND needed

2) On the other hand, if you need to operate a machine or some other 
mechanical process for, say, 15 hours over night, then the date end needs to 
differ for the night when the DST switch occurs. => DTSTART and DURATION 
needed

Cheers,
Reinhold

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