Below are the dates for, among others, April Fool's Day 2012 and April Fool'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
April Fool's Day 2012	April 1, 2012	Sunday	14	57
April Fool's Day 2013	April 1, 2013	Monday	14	422
April Fool's Day 2014	April 1, 2014	Tuesday	14	787
April Fool's Day 2015	April 1, 2015	Wednesday	14	1152
April Fool's Day 2016	April 1, 2016	Friday	13	1518
April Fool's Day 2017	April 1, 2017	Saturday	13	1883
April Fool's Day 2018	April 1, 2018	Sunday	14	2248
April Fool's Day 2019	April 1, 2019	Monday	14	2613
April Fool's Day 2020	April 1, 2020	Wednesday	14	2979
April Fool's Day 2021	April 1, 2021	Thursday	13	3344
April Fool's Day 2022	April 1, 2022	Friday	13	3709

See besides 'April Fool'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.