Overview
Project deadlines, age calculations, and business day math - when spreadsheets are overkill.
The calculator counts calendar days. It does not know your office holidays, so add those yourself when a deadline depends on them.
How to use it
- Open Unix Timestamp Converter.
- Enter the value once, read the result, and spot-check it against a date you already know.
- Keep Age Calculator or Date Calculator for a second phase.
Good to know
Holiday rules and local business days are not assumed unless the page says so. Confirm anything that has a legal or payroll deadline.
The tools are free on the TimerClock home page. Settings stay in this browser. The privacy policy explains what is stored.
Frequently asked questions
What is this guide for?
Project deadlines, age calculations, and business day math - when spreadsheets are overkill.
Which TimerClock page should I open?
Start with Unix Timestamp Converter. Use Age Calculator when you want a closer variation.
Does a date calculator know public holidays?
No. It counts calendar days. Add or skip holidays yourself when the deadline depends on them.
Are results stored?
The calculation runs in the browser. Copy the result if you need it later.
When was this guide updated?
October 2, 2026. The steps match the tools linked on this page.