Quick answer
Days until Inauguration Day = the date of the next Inauguration Day minus your start date. Counting from 10 March 2024 the next one is Monday 20 January 2025, which is 316 days away.
Pick a start date (it defaults to today). The calculator returns the days, the weeks and days, and the weekday of the date.
Related tools: Days Until Labor Day: Days until US Labor Day (first Monday of September). Days Until Father's Day: Days until US Father's Day (third Sunday of June). Days Until Mother's Day: Days until US Mother's Day (second Sunday of May).
How to use the Days Until Inauguration Day
- Optionally, pick counting from.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Counting from (optional) | A calendar date. Leave blank to use today's date | — |
Formula and method
Formula
days = next occurrence of US Inauguration Day (20 January after a presidential election year) − start date
Exact integer day arithmetic in UTC.
Finds the next occurrence of US Inauguration Day (20 January after a presidential election year) on or after the start date using its calendar rule. Four-year cycle from 1 January 1937 onward (years ≡ 1 mod 4). When 20 January is a Sunday the public ceremony may be held on the 21st. Dates follow the proleptic Gregorian calendar.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Counting from = 2024-03-10.
| Result | Value |
|---|---|
| Days Until Inauguration Day | 316 days |
| Date | 2025-01-20 |
| Weekday | Monday |
| Weeks and days | 45 weeks, 1 day |
Example 2
Inputs: Counting from = 2025-01-21.
| Result | Value |
|---|---|
| Days Until Inauguration Day | 1460 days |
| Date | 2029-01-20 |
| Weekday | Saturday |
| Weeks and days | 208 weeks, 4 days |
The first line is the headline result (days Until Inauguration Day). Below it the days Until Inauguration Day lists date, weekday and weeks and days, which describe the same case from other angles. Exact integer day arithmetic in UTC.
About Inauguration Day
Inauguration Day is 20 January following a presidential election, a date fixed by the 20th Amendment (in force since 1937). It happens every four years, and when 20 January falls on a Sunday the public ceremony is held on Monday.
The next dates
Upcoming dates: Monday 20 January 2025; Saturday 20 January 2029; Thursday 20 January 2033. The count is zero on the day itself, and once this year's date has passed the calculator moves on to the next one.
Days Until Inauguration Day from different start dates
The same calculator run from 1 January of four consecutive years.
| Counting from | Days Until Inauguration Day | Date | Weekday |
|---|---|---|---|
| 2026-01-01 | 1115 | 2029-01-20 | Saturday |
| 2027-01-01 | 750 | 2029-01-20 | Saturday |
| 2028-01-01 | 385 | 2029-01-20 | Saturday |
| 2029-01-01 | 19 | 2029-01-20 | Saturday |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Counting from: entering "2024-02-30" shows "Counting from must be a valid date." beside that field and no result.
Choosing between the Days Until Inauguration Day and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Days Until Labor Day](/date-calendar/days-until-labor-day/) | Days Until Labor Day | |
| [Days Until Father's Day](/date-calendar/days-until-fathers-day/) | Days Until Father's Day | |
| [Days Until Mother's Day](/date-calendar/days-until-mothers-day/) | Days Until Mother's Day | |
| [Days Until MLK Day](/date-calendar/days-until-mlk-day/) | Days Until MLK Day | |
| [Days Until Presidents' Day](/date-calendar/days-until-presidents-day/) | Days Until Presidents' Day |
Background: date rules
Holiday dates are defined in three ways: a fixed day of the month, a weekday position such as the fourth Thursday of November, or a calendar calculation such as the date of Easter. Counts are in whole calendar days from the start date, and the date is the calendar date, not adjusted for your time zone or for days a workplace observes instead.
Assumptions and limitations
- Counting on the holiday itself gives 0
- After the date has passed this year the next year's date is used
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for counting from to confirm this.
Frequently asked questions
How many days until Inauguration Day from today?
Enter today as the start date. From 10 March 2024 the answer is 316 days.
What day of the week is it next year?
Upcoming weekdays: Monday 20 January 2025; Saturday 20 January 2029; Thursday 20 January 2033.
What does the Days Until Inauguration Day calculate?
Days until US Inauguration Day (20 January after a presidential election year). It returns Days Until Inauguration Day, Date, Weekday and Weeks and days.
What formula does the Days Until Inauguration Day use?
days = next occurrence of US Inauguration Day (20 January after a presidential election year) − start date. Finds the next occurrence of US Inauguration Day (20 January after a presidential election year) on or after the start date using its calendar rule.
What is an example of a days Until Inauguration Day result?
With counting from 2024-03-10, the days Until Inauguration Day is 316 days.
Related calculators
- Days Until Labor Day — Days until US Labor Day (first Monday of September).
- Days Until Father's Day — Days until US Father's Day (third Sunday of June).
- Days Until Mother's Day — Days until US Mother's Day (second Sunday of May).
- Days Until MLK Day — Days until US Martin Luther King Jr. Day (third Monday of January).
- Days Until Presidents' Day — Days until US Washington's Birthday / Presidents' Day (third Monday of February).
- Days Until Valentine's Day — Days until Valentine's Day.
- Days Until St. Patrick's Day — Days until St. Patrick's Day.
- Days Until Veterans Day — Days until Veterans Day (US, 11 November).
- Days Until International Women's Day — Days until International Women's Day.
Sources
- US federal holiday rules: 5 U.S.C. § 6103
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.