The Next Web: 25 Google Calendar Hacks to Maximize Productivity. “Released to the general public in July 2009, Google Calendar is one of the favored time management and scheduling apps available. And, for a good reason. I know a lot at Google Calendar. Here are 25 Google calendar hacks to maximize productivity that every person needs to know how to use.” usually when there are over 20 tips in a list like this, the annotation sucks. Not this time! Plenty of information here. Writer is the founder of Calendar, which looks its own calendar company, and I don’t even care. Good article.