日期差计算
算两个日期之间隔了多少天、周、工作日，跨年也准确。
含两端日期；工作日按周一至周五计。
中文介绍
行程规划、签证停留天数、活动倒计时都离不开「两个日期之间隔多久」。这个工具算总天数（含首尾）、周数、工作日（周一至周五）与日历周，跨年也准确。
例如签证停留 90 天，输入入境与离境日期即可核对是否超期；规划行程时也能快速确认总时长。
常见问题
总天数含不含首尾？
含。比如 1 号到 3 号算 3 天（1、2、3 号）。签证停留计算通常按此口径。
工作日怎么算？
按周一至周五计，不含周末，也不剔除法定节假日（那是日历日，需另行扣除）。
跨年准确吗？
准确。基于公历精确计算，任意年份区间都成立。
English
Trip planning, visa stay limits and countdowns all come back to "how long between two dates". This tool counts total days (inclusive), weeks, working days (Mon-Fri) and calendar weeks, accurately across years.
For a 90-day visa stay, enter entry and exit dates to check you won't overstay; for trip planning, confirm the total duration at a glance.
FAQ
Are both endpoints counted?
Yes. The 1st to the 3rd is 3 days (1, 2, 3). Visa stay calculations usually use this convention.
How are working days counted?
Monday to Friday, excluding weekends; statutory holidays aren't removed (those are calendar days you'd subtract separately).
Is it accurate across years?
Yes. It's computed on the Gregorian calendar and holds for any date range.