Deadline Calculator
Add or subtract days from a start date, then correct the result for weekends and holidays if needed.
This is useful for filing dates, project milestones, due dates, and other time-sensitive planning.
Result
--
Run the calculation to see the deadline.
| Metric | Value |
|---|---|
| Raw deadline | -- |
| Corrected deadline | -- |
| Weekday | -- |
| US holiday | -- |
Quick Answer
The calculator adds or subtracts a day count from a start date and can move the result off weekends or holidays.
How to Calculate
- Choose the start date.
- Enter the number of days.
- Choose whether the deadline is after or before the start date.
- Select a correction rule and click Calculate.
Formula
After = start date + days
Before = start date - days
Weekend and holiday correction moves the result to the nearest business day in the chosen direction.
Worked Examples
Example 1: A 30-day deadline after March 29 lands on April 28 before corrections.
Example 2: A deadline on Saturday can move to Monday with weekend correction.
Example 3: A filing date near Christmas may shift forward to the next business day if holiday correction is enabled.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Raw deadline | The unadjusted date after adding or subtracting days. | Use it as the base result. |
| Corrected deadline | The business-day adjusted date. | Use it when weekends or holidays matter. |
| No change | The raw date already meets the rule. | No further adjustment is needed. |
Frequently Asked Questions
Related Calculators
References
- OmniCalculator reference page
- The calculator uses date addition and subtraction with optional business-day corrections.
- Last reviewed: March 2026.