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D-Day Calculator

Track exams, launches, anniversaries, trips, and contracts with D-minus, D-plus, custom workweeks, holidays, repeat dates, and reminder milestones.

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Date

D-Day result

D-100

left until the target date

Target date

Dec 11, 2026

Friday

Counting mode

Calendar days

Count from

Calendar span

3.3 months

0 years ? 3 months ? 9 days

Progress

0%

Elapsed

0 days

Remaining

100 days

Reminder milestones

D-100

Sep 2, 2026

Wednesday

D-30

Nov 11, 2026

Wednesday

D-7

Dec 4, 2026

Friday

D-1

Dec 10, 2026

Thursday

Counting mode

Quick target dates

Advanced counting settings

Repeat

Weekend days

Select the days that should not count as business days.

Add or subtract a period

Calculate a new target date from the count-from date. Business days use your weekend and holiday settings.

Calendar days

100

days

Business days

72

days

Weekend days

28

days

Excluded holidays

0

days

Full weeks

14

Extra days: 2

Hours

2,400

Hours

How the D-Day calculation works

The tool compares two calendar dates in UTC day units, then adds optional start-day inclusion, yearly-anniversary adjustment, and a business-day split for practical planning.

Usage notes

  • Calendar mode shows the exact D-minus or D-plus distance between two dates.
  • Business-day mode separates weekdays and weekends, which is useful for work, launch, and delivery planning.
  • Yearly anniversary mode moves a past month/day to the next occurrence automatically.

Frequently asked questions

Why can D-Day differ by one day between websites?expand_more

Some rules include the starting day and some do not. Use the include-start option to match your counting rule.

Are public holidays excluded from business days?expand_more

Yes. Enter custom holiday dates in the advanced settings. Dates that already fall on a selected weekend are not excluded twice.

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