One of the very best apps on my Mac is Fantastical. You use it conjunction with the default Apple calendar. Want to make a calendar entry in the future? Just type “Bob next Thursday at 4pm.” Or type “Bob every Thursday at 4pm until 4:20pm.” Or “Bob every 25th day of month at 2pm.” Or Bob “On the Thursday after President’s Day in 2015 from 4pm until 7pm.” Mac, a couple of bucks. If you synch your calendars via iCloud, the appointment will be on your iPhone and iPad before you can open the calendar. Got it? Get it. Saves huge amounts of time and also removes an obstacle to calendaring. I’ve been using it for months and would never take it off my MacBook.