Dates and time
Working out ages, date gaps, hours worked and how the calendar really behaves.
- Article · September 19, 2026Decimal Hours Explained: Why 7:45 Is Not 7.45Minutes are out of 60, decimals are out of 100. Converting between them is a simple division once you see why.
- Guide · September 19, 2026How to Calculate Age From a Date of BirthAge is a count of complete years, then leftover months and days. Here is the method and the leap-day edge case.
- Guide · September 19, 2026How to Calculate Hours Between Two TimesWork out the hours between two clock times, including breaks and shifts that cross midnight, and convert to decimal hours.
- Guide · September 19, 2026How to Calculate the Days Between Two DatesA reliable way to count days between dates by hand, with the inclusive versus exclusive question and working days explained.
- Article · September 19, 2026Why Leap Years Exist and How the Rule WorksEarth takes about 365.2422 days to orbit the Sun. The leap year rule is a way of keeping the calendar in step with the seasons.