offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers

Add/Subtract Date & Time

Add or subtract years, months, days, and hours from any date

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Start Date

Operation

Years

Months

Days

Hours

Count business days only (skip weekends)

Quick Actions

Tip: Enable "business days only" to automatically skip weekends when adding or subtracting days. Perfect for project deadline calculations!

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.