Business Days Calculator

Calculate business days and date differences with clear rules. Choose your dates, decide whether each endpoint counts, and see an explanation of the result.

FOUR FOCUSED TOOLS • Days between dates: count calendar days with explicit Include Start Date and Include End Date options. • Add days to a date or subtract them to find an earlier date. • Working days between dates: use your own working week. • Add or subtract workdays while skipping non-working weekdays and dates you exclude.

YOUR WORKING WEEK Choose Monday–Friday, Sunday–Thursday, Monday–Saturday, or any other valid combination. Add your own excluded dates with optional labels. No public holiday calendar is supplied; you control these dates yourself.

CLEAR RESULTS Expand “How was this calculated?” to see calendar days, the counting boundaries, non-working weekdays and excluded dates skipped. Reversed date ranges show absolute counts and explain their direction. Zero-day offsets return the starting date. The same date counts as one day only when both endpoints are included.

FAST AND LOCAL Keep your five most recent calculations and tap one to reload it, including its original working-day rules. Copy a result, use date shortcuts, choose a date format and switch between light, dark and system appearance.

Your calculations and saved dates stay on your device. The core tools work offline with no account, server or calendar access. Includes banner ads and optional rewarded ads. Watch an ad to unlock Batch Calculator for this app session, or hide banners for 30 minutes. Core calculations and result explanations are always available without watching an ad. No subscriptions. Clearing history removes recent records; excluded dates can be deleted individually. Uninstalling removes local data. Settings do not sync to another device.

Uses the standard ISO calendar for dates from 1900 through 9999. Day-offset magnitude is limited to 1,000,000, and results must stay in the supported date range. This is a date calculation utility; it does not determine legal deadlines or automatically apply regional public holidays.

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