You can download these dates onto your calendar. (.ics)
Right click Save-As to download Biblical Feast & Israel Days
You may also subscribe to this calendar by copying this URL and pasting it in your calendar program where it asks for a URL for Subscription: http://blog.toratchaiim.org/ics/Biblical-Feast-Israel-Days.ics
For example, under Google calendar, you can go to OTHER CALENDARS, click ADD BY URL and insert the URL. Alternatively, you may wish to click on the +Google Calendar button (bottom right of the calendar) and it will direct you to your google account to subscribe to the calendar.
If you use Mac Calendar, click on NEW CALENDAR SUBSCRIPTION under the FILE tab, and insert the URL.