Add Days

What Add Days does

Shifts a local date by whole days and names the resulting weekday. Unlike Add Business Days this counts weekends. Unlike Add Weeks this is day-sized, not week-sized. Invalid dates fail.

This URL is only for Add Days (datetime · add days). Add calendar days; shows result weekday. Other Date & time tools on Tool-You look similar in the chrome, so the job definition below is the part that belongs to Add Days alone: Shifts a local date by whole days and names the resulting weekday. Unlike Add Business Days this counts weekends. Unlike Add Weeks this is day-sized, not week-sized. Invalid dates fail.

How to use Add Days

1. Confirm you need Add Days, not Date Difference (Count days, weeks, and calendar span between dates.). Address: /datetime/add-days.
2. Enter the numbers or dates Add Days uses. Add calendar days; shows result weekday.
3. Read the result as Add Days defines it — not as Add Business Days (Add weekdays only; shows result weekday.). Shifts a local date by whole days and names the resulting weekday. Unlike Add Business Days this counts weekends. Unlike Add Weeks this is day-sized, not week-sized. Invalid dates fail.
4. Add Days is an estimate in the browser, not professional advice. Local calendar days. Weekday names are English short forms.
5. Need a different formula? Try Add Business Days (Add weekdays only; shows result weekday.) instead of stretching Add Days.

When not to use Add Days

Skip Add Days when a neighbor tool matches better — start with Date Difference or Add Business Days — or when the description already warns the job will fail. In the tool’s own words: Shifts a local date by whole days and names the resulting weekday. Unlike Add Business Days this counts weekends. Unlike Add Weeks this is day-sized, not week-sized. Invalid dates fail.

Questions about Add Days

What does Add Days do that other Date & time pages on this site do not?

Shifts a local date by whole days and names the resulting weekday. Unlike Add Business Days this counts weekends. Unlike Add Weeks this is day-sized, not week-sized. Invalid dates fail. Short version: Add calendar days; shows result weekday.

Does Add Days upload my file or text to Tool-You servers?

No. Add Days runs in this browser tab. Files stay on the device. Limit note: Local calendar days. Weekday names are English short forms.

Should I use Date Difference instead of Add Days?

Use Add Days when you need Add calendar days; shows result weekday. Use Date Difference when you need Count days, weeks, and calendar span between dates. They share a category (Date & time) but not the same job.

What are the limits of Add Days?

Local calendar days. Weekday names are English short forms. Also: Shifts a local date by whole days and names the resulting weekday. Unlike Add Business Days this counts weekends. Unlike Add Weeks this is day-sized, not week-sized. Invalid dates fail.