Date Add Calculator for Days, Weeks & Business Days
Add or subtract days, weeks, months, years, or business days from a start date in your browser for schedules, deadlines, timelines, and planning notes.
Ready to use
Browser-side · no account · results stay on this page
Result
2026-06-20
Sunday, June 21, 2026
Add a positive amount to move forward in time, or a negative amount to move backward.
Business day mode skips weekends for day-based offsets.
Use exact start dates
Pick the calendar date that should count as the baseline.
Choose the right unit
Use days for precise offsets, weeks for schedule blocks, and months or years for calendar planning.
Example
Adding 30 days to May 22, 2026 gives June 21, 2026.
Assumption
Business day mode excludes weekends only.
Limitation
Public holidays, local legal rules, and cutoff times are not included.
Project deadlines
Find dates after fixed day offsets.
Billing cycles
Add months or years to renewal dates.
Scheduling
Move forward by workday counts.
Content calendars
Plan publish dates from a start date.
Can I subtract days from a date?
Yes. Enter a negative amount to subtract days, weeks, months, or years.
What does business days mode do?
Business days mode skips Saturdays and Sundays when the selected unit is days.
Does it account for holidays?
No. This page skips weekends only; use a holiday-aware workflow for payroll or legal deadlines.
How is the date calculation processed?
The date calculation is handled in the browser for this tool based on the current public implementation.
Can I subtract days from a date?
Yes. Enter a negative amount to subtract days, weeks, months, or years.
What does business days mode do?
Business days mode skips Saturdays and Sundays when the selected unit is days.
Does it account for holidays?
No. This page skips weekends only; use a holiday-aware workflow for payroll or legal deadlines.
How is the date calculation processed?
The date calculation is handled in the browser for this tool based on the current public implementation.
Suggested workflow
Date planning workflow
Add offsets, count business days, then calculate detailed differences.