What the tool does, how to run it, and what to expect from the result.
Pick a start date, enter how many days, weeks, months or business days to add (negative to go back) and read the result with its weekday and ISO week. Business days skip weekends and US federal holidays: 10 business days after Friday November 20, 2026, stepping over Thanksgiving, lands on Monday December 7. Adding a month to January 31 gives the last day of February.
A quick way to understand who this helps, what it solves, and where it connects next.
Anyone planning dates, deadlines, shifts or payroll.
Using the add days to a date without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
Leave today as the start date and enter 90; the result shows the exact date and weekday.
If the target month is shorter, the result is its last day: January 31 plus one month is February 28 (29 in a leap year).
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