Time Tools
D-Day Calculator
Calculate remaining or elapsed days between a base date and a target date.
Input / output
What date are you counting to?
Calculated from today by default.
Quick select
Advanced options
D-Day summary
D-100
Target date · remaining
2026-08-10 → 2026-11-18
Counted days
101 days
Calendar days: 100 days
Business days
73
Weekend days: 28 · Holidays excluded: 0
D-Day 계산 리포트
Target date: D-100
Formula
계산 일수 = 달력 일수 + 목표일 포함 보정
Reference dates
기준일: 2026-08-10
다음 확인일: 2026-11-18
Assumptions
기준일: 2026-08-10
목표일: 2026-11-18
목표일 포함: 예
주말 제외: 예
휴일 0개 제외
Limits
업무일 계산은 입력한 휴일 목록만 제외하며 국가별/회사별 휴무일을 자동 조회하지 않습니다.
법정 기한, 계약 마감, 급여 산정처럼 공식 기준이 필요한 일정은 별도 기준을 확인하세요.
Copyable D-Day summary
D-Day result summary event=Target date label=D-100 baseDate=2026-08-10 targetDate=2026-11-18 countedDays=101 businessDays=73 local-only=true local-only: dates are calculated in this browser and are not uploaded.
View detailed calculation
weeks
14.43
months
3.37
years
0.28
D-Day range board
Base date
2026-08-10
Mon · D-Day
Midpoint
2026-09-29
Tue · D-50
Target date
2026-11-18
Wed · D-100
Timeline preview
Base date
2026-08-10
Mon · D-Day
Midpoint
2026-09-29
Tue · D-50
Target date
2026-11-18
Wed · D-100
Tool usage summary
Calculate remaining or elapsed days between a base date and a target date.
- Example
- 2026-05-01 -> 2026-05-10 -> D-9
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HelpOpen usage notes, examples, practical tips, and FAQ only when you need them.
What is this tool?
D-Day Calculator is a browser-first tool for calculate remaining or elapsed days between a base date and a target date. It fits into the time workflow and keeps the main task on one page.
How to use it
- Enter the input
Paste or edit the value in the input area. Sample values are safe placeholders for testing the tool.
- Adjust options
Choose the mode, format, unit, or count that matches the D-Day, date difference, deadline task.
- Review the result
Run the tool, inspect the output, then copy or download it only when the result matches your expectation.
Examples
D-Day Calculator example
- Input
- 2026-05-01 -> 2026-05-10
- Output
- D-9
Practical tips
- For large inputs, process the smallest useful sample first to keep the browser responsive.
- Ad slots are intentionally kept away from tool controls and result panes.
FAQ
What input should I use with D-Day Calculator?
Use values that match the D-Day, date difference task, then adjust the visible options before running the tool.
Can I copy the D-Day Calculator result?
Yes. Review the output first, then copy or download it when the result matches your expectation.
Can I use D-Day Calculator on mobile?
Yes. The input, options, action, and result areas are designed to stack cleanly on small screens.
Will ads interrupt D-Day Calculator?
No. Ad slots stay outside the input, output, and primary action areas so the tool remains usable and policy-safe.
