Below are the dates for, among others, St. Patrick's Day 2012 and St. Patrick's Day 2013.
You can also see on which day the holiday falls and how many days it is until this holiday.

Holiday	Date		Week number	Number of days to go
St. Patrick's Day 2012	March 17, 2012	Saturday	11	42
St. Patrick's Day 2013	March 17, 2013	Sunday	12	407
St. Patrick's Day 2014	March 17, 2014	Monday	12	772
St. Patrick's Day 2015	March 17, 2015	Tuesday	12	1137
St. Patrick's Day 2016	March 17, 2016	Thursday	11	1503
St. Patrick's Day 2017	March 17, 2017	Friday	11	1868
St. Patrick's Day 2018	March 17, 2018	Saturday	11	2233
St. Patrick's Day 2019	March 17, 2019	Sunday	12	2598
St. Patrick's Day 2020	March 17, 2020	Tuesday	12	2964
St. Patrick's Day 2021	March 17, 2021	Wednesday	11	3329
St. Patrick's Day 2022	March 17, 2022	Thursday	11	3694

See besides 'St. Patrick's Day' even more holidays, click on one of the links below.
2012 Holidays   •   2013 Holidays   •   2014 Holidays   •   2015 Holidays

See also the 2012 Calendar.