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copied!<p>I had a similar problem and found usefull the answer to "How can I create more complex appointments in my org-files?" in the FAQ at <a href="http://orgmode.org/worg/org-faq.html#Appointments/Diary">http://orgmode.org/worg/org-faq.html#Appointments/Diary</a> You can even add exceptions for holidays. I was not able to make work the time though: when you add it the formula stops working :(</p> <p>1) My example: Courses on Tuesdays and Thursdays falling in [2011-03-07 Mon]--[2011-06-25 Sat] minus [2011-05-15 Sun]--[2011-05-20 Fri] (a week of holiday):</p> <pre><code>** TEST Tuesday and Thursday in [2011-03-07 Mon]-[2011-06-20 Mon] minus holidays [2011-05-15 Sun]-[2011-05-22 Sun] <%%(and (diary-block 3 7 2011 6 20 2011)(or (= 2 (calendar-day-of-week date) (= 4 (calendar-day-of-week date))))(not (diary-block 5 15 2011 5 22 2011)))> </code></pre> <p>If you decompose the boolean function, you get the following, which is self explanatory:</p> <pre><code><%%(and (diary-block 3 7 2011 6 20 2011) (or (= 2 (calendar-day-of-week date) (= 4 (calendar-day-of-week date)))) (not (diary-block 5 15 2011 5 22 2011)) )> </code></pre> <p>2) My suggestion for your case: a class every Tuesday every week from March to June (I took the liberty to fix the year to 2011):</p> <pre><code><%%(and (= 2 (calendar-day-of-week date)) (diary-block 3 23 2011 6 23 2011)))> </code></pre> <p>You might want to have a look to the newly added section "How can I schedule a weekly class that lasts for a limited period of time?", about the function "org-diary-class", but it still seems to have problem with scheduling hours :(</p> <p>Hope it helps,</p>

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