Dates and time

Working days, deadlines, ages and time zones — the arithmetic that looks trivial until a contract depends on it. Written for the calculations people actually get wrong.

Converters Text tools Passwords and privacy QR codes and sharing Dates and time

3 guides

A close-up of a hand turning the page of a wall calendar from February to March, with a desk lamp casting warm light on the paper.

Calculating Exact Age: Free Online Tools and the Leap-Year Problem

Learn how to calculate exact age in years, months and days, why the 365.25 shortcut fails, and when to use free online tools versus a spreadsheet or solicitor.

Dates and time 8 min read

A desk calendar showing a marked deadline sits beside a pen and a printed contract in soft office light.

Working Days, Business Days and Free Online Tools: A Deadline Guide

Learn what 'five working days' really means, why public holidays break automatic counts, and how to set deadlines no one can misread.

Dates and time 8 min read

A shallow-focus photograph of a vintage brass calendar mechanism with two adjustable date pointers set several days apart, resting on a textured linen surface.

Days Between Two Dates: Why Free Online Tools Can Get It Wrong

Learn to count days between two dates accurately, know when browser calculators help, and why notice periods, interest and deadlines need more than a calendar.

Dates and time 8 min read