I published at the beginning of 2007 the first GCalendar version on the JED, since that time GCalendar has used the Google calendar API v1. It was working well in all this years, but it didn't meet the requirements of modern architecture nowadays and that's why Google decided to build a new API from ground up (v3). It is more secure (OAuth authentication) faster (JSON protocol) and more feature rich (event colors, enc more....). Since the beginning of DPCalendar we us the Google calendar API v3 in our Professional Google Plugin.
As we announced in April this year (2014), Google will shut down their calendar API which GCalendar used since years on the 17. November 2014. We do offer a migration path for GCalendar users to use their existing GCalendar installation with the FREE package of DPCalendar on their Joomla 2.5 or 3.x web site. Yesterday was the day, Google shut down their Google calendar API v1 and v2. Since Sunday we are seeing an increase in traffic and downloads of DPCalendar. Looks like people started to do the migration. Additionally we got GREAT feedback about the evolvement of GCalendar into DPCalendar.
We have big plans for 2015 with DPCalendar and brand new responsive Joomla extensions. More information will be published at the beginning of 2015. We hope that you will have a great time with DPCalendar as you had with GCalendar! Let's move on to new spheres....