Inputs
About this tool
This calculator returns dates exactly ninety days before and after the chosen start date. Toggle inclusive counting to align with legal or compliance conventions.
Calendar days Business days Holidays CSV/PDF exportResults
Start date: 2026-01-26 • Timezone: Asia/Karachi • Inclusive: No • Business days: No
| Item | Date | Day of week | Notes |
|---|---|---|---|
| 90 days after (calendar) | 2026-04-26 | Sunday | Includes start day: No |
| 90 days before (calendar) | 2025-10-28 | Tuesday | Includes start day: No |
90-day range (calendar): 2026-01-27 to 2026-04-26 — 12 weeks 5 days (89 days total)
Example data table
Illustrative examples computed as exclusive counting on calendar days.
| Start date | 90 days after | Day of week | Span description |
|---|---|---|---|
| 2026-01-01 | 2026-04-01 | Wednesday | 12 weeks 6 days (90 days total) |
| 2025-01-01 | 2025-04-01 | Tuesday | 12 weeks 6 days (90 days total) |
| 2025-12-31 | 2026-03-31 | Tuesday | 12 weeks 6 days (90 days total) |
Formulas used
- Calendar days: End = Start + K days. With inclusive counting, K = 89 for a ninety-day window; with exclusive counting, K = 90.
- Business days: Iterate day by day, counting only Monday–Friday and excluding listed holidays until ninety counted days are reached. For before/after, step backward or forward respectively.
- Week and day breakdown: Total days = 90. Weeks = ⌊Total/7⌋, Remainder = Total mod 7.
- Day of week: Derived from the resulting date using standard weekday numbering (1=Mon … 7=Sun).
Different jurisdictions may define counting rules differently. Always confirm whether the start day is counted and whether weekends or holidays are excluded.
How to use this calculator
- Choose the Start date and your preferred Timezone.
- Decide if the period should be inclusive (start day counts as day 1) or exclusive.
- If you need working-day logic, check Business days only and optionally enter holidays to exclude.
- Click Calculate. Review after and before dates plus the 90‑day range summary.
- Use the Download CSV or Download PDF buttons to save your results.
- Print the results for documentation using your browser’s print dialog if preferred.
FAQs
It depends on the rule set. Many regimes exclude the start day and begin counting the day after. Use the inclusive checkbox to match your requirement.
A business day is Monday through Friday by default. You may add holiday dates to exclude them. Local definitions can vary; adjust as needed.
If you create or view dates near midnight, a different timezone can shift the calendar date. Choose the timezone that matches your workflow or jurisdiction.
Yes. The results panel shows both ninety days after and ninety days before the start date, using your chosen counting rules.
When business days are selected, any date you list as a holiday will be skipped and won’t count toward the ninety days.
Use the CSV or PDF buttons to download. CSV contains the results table. PDF captures the results card for easy sharing or filing.