Calendar Add to Calendar Add to Timely Calendar Add to Google Add to Outlook Add to Apple Calendar Add to other calendar Export to XML When: February 17, 2019 all-day 2019-02-17T00:00:00-08:00 2019-02-18T00:00:00-08:00 Christianity This day marks the beginning of the ten weeks preceding Holy Pascha (Easter). The term Triodion refers to the book containing the liturgies for the worship services during this time period.