Project planning
Measure how many working days sit between kickoff and launch.
单位转换器
日期时长计算器
以秒为单位测量任意两个日期之间的时间。
选择开始和结束日期，即可立即查看以天、周、月、年和常见工作日友好单位表示的时长。
Calendar-day difference
Date after or before N days
Weekdays only vs business days with holidays
Count days between dates
Pick a start and end date to measure the calendar span. Results use standard “between dates” semantics, so the same day returns 0 days.
Quick planning presets
Set the end date from the start date with one tap for common planning horizons.
Days between your dates
There are 30 calendar days between 2026年2月27日 and 2026年3月29日.
Months and years are approximate so you can estimate longer timelines quickly.
Calendar days
30
Weekdays only (Mon–Fri)
20
Counts weekdays after the start date up to the end date.
Selected workweek days
20
Mon-Fri
Business days with holidays
20
Starts from the weekday count, then removes national public holidays for the selected country.
Weeks (exact)
4.29
Months (approx.)
0.99
Years (approx.)
0.082
Excluded holidays
No holiday dates were excluded for the current range and workweek.
Add or subtract days from a date
Find the date after 7, 30, or 90 days, or move backward from a deadline to a planning start date.
Offset shortcuts
Use positive values for future dates and negative values for past dates.
+30 days from 2026年3月29日 is 2026年4月28日.
Resulting date
2026年4月28日
Day of week
星期二
Weekdays and business days
Compare the raw weekday count with a holiday-aware business-day count so you can plan staffing, approvals, shipping, and project schedules more accurately.
The holiday-aware count uses public holidays for the selected scope.
Optional. Use a more specific holiday scope when your planning depends on state-level public holidays.
Custom workweek
Pick the weekly schedule that matches your team, operation, or market before holidays are removed.
United States
Public holidays can be filtered by the selected holiday scope. Company shutdowns and custom leave calendars are not included.
2026
When this date calculator helps most
Shipping and procurement
Check whether a quoted lead time includes weekends or public holidays.
HR and operations
Count business days across notice periods, onboarding windows, or approval timelines.
常见问题
是否处理闰年？
是的。计算器计算实际的日历天数，因此会自动包含闰日和月份长度。
如何计算工作日？
工作日总数包括周一至周五，跳过周六和周日。不排除公共假期。
我可以计算回溯时间吗？
当然可以。如果结束日期早于开始日期，工具会自动交换它们，并仍返回正向时长。