sebbo2002/ical-generator — pull request #5 by FredericoC (2014-03-03 06:06:35+00:00)
Title: added "setTTL" method to set the "X-PUBLISHED-TTL" property

Specifies a suggested iCalendar file download frequency for clients and servers with sync capabilities
http://msdn.microsoft.com/en-us/library/ee178699(v=exchg.80).aspx