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How Many Days Until St. Patrick’s Day?

Count the days until the next St. Patrick’s Day, March 17, with the weekday and full weeks.

What this tool does

Count the days until the next St. Patrick’s Day, March 17, with the weekday and full weeks. You fill in these fields: Count from. It shows days until St. Patrick’s Day, next St. Patrick’s Day, and weeks and days.

Inputs

  • Count from: A date. Starts as today's date. Defaults to today. Change it to count from another day.

How to use

  1. Pick a date for "Count from".
  2. Read the result: days until St. Patrick’s Day, next St. Patrick’s Day, and weeks and days. It appears once every required field has a valid value.

Worked examples

Example 1. Inputs:

  • Count from: March 1, 2026

Results:

  • Days until St. Patrick’s Day: 16 days
  • Next St. Patrick’s Day: Tuesday, March 17, 2026
  • Weeks and days: 2 weeks, 2 days

How this is worked out: Mar 1 to Mar 17 is 16 days. Mar 17 2026: Jan 1 2026 is a Thursday, Mar 17 is day 76, 75 mod 7 = 5, Thu + 5 = Tuesday.

Example 2. Inputs:

  • Count from: October 8, 2026

Results:

  • Days until St. Patrick’s Day: 160 days
  • Next St. Patrick’s Day: Wednesday, March 17, 2027
  • Weeks and days: 22 weeks, 6 days

How this is worked out: Oct 8 to Oct 31 = 23, then Nov 30, Dec 31, Jan 31, Feb 28 (2027 is not a leap year), plus 17 into March: 23+30+31+31+28+17 = 160. Mar 17 2027: Jan 1 2027 is a Friday, day 76, 75 mod 7 = 5, Fri + 5 = Wednesday.

Example 3. Inputs:

  • Count from: March 17, 2026

Results:

  • Days until St. Patrick’s Day: 0 days
  • Next St. Patrick’s Day: Tuesday, March 17, 2026
  • Weeks and days: 0 weeks, 0 days
  • Note: St. Patrick’s Day is the day you picked, so there are 0 days to go.

How this is worked out: On the date itself the count is 0.

Example 4. Inputs:

  • Count from: March 18, 2026

Results:

  • Days until St. Patrick’s Day: 364 days
  • Next St. Patrick’s Day: Wednesday, March 17, 2027
  • Weeks and days: 52 weeks, 0 days

How this is worked out: Mar 18 2026 to Mar 17 2027 is 365 days minus 1 = 364 (no Feb 29 in between).

Where this comes from

The next time a month and day comes round. Finds the next time a month and day comes round, on or after the start date. If the start date is that day, there are 0 days to go. A February 29 date is observed on February 28 in a year that is not a leap year. Source: The Gregorian calendar: month lengths and the leap year rule (every fourth year, except century years not divisible by 400).

St. Patrick’s Day. March 17, the date St. Patrick’s Day is held every year. Source: As stated on the reviewed page this entry was made from (reviewed 2026-10-08). No document was fetched.

Limitations

  • Counts to St. Patrick’s Day only, each year. An event held on a nearby weekday or weekend instead is not accounted for.
  • Counts whole calendar days and ignores time zones and the time of day.
  • Uses the Gregorian calendar for every date, for years 1 to 9999.
  • Counts to March 17 only. Parades and events held on a nearby weekend are not accounted for.

FAQs

Q: What does it count down to?
A: St. Patrick’s Day, the next time it comes round on or after the date you count from.
Q: What if the date I count from is St. Patrick’s Day?
A: The tool shows 0 days and says so. It does not skip ahead to next year.
Q: What if St. Patrick’s Day has already passed this year?
A: It counts to St. Patrick’s Day of the following year.
Q: Can I count from a date other than today?
A: Yes. Change the Count from date. It starts as today's date.
Q: Does the count include the day I start from?
A: No. It counts the days between the two dates, so the day before St. Patrick’s Day shows 1 day.
Q: How are the days counted?
A: As whole calendar days from the start date to the target date, with leap years included. Time of day and time zones are ignored.
Q: What date does it count to?
A: March 17, the date St. Patrick’s Day is held every year.

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