How to Add and Subtract Time (Hours, Minutes, Seconds)
Learn how to add and subtract time in hours, minutes and seconds, carry over 60 minutes, handle times past midnight and convert to decimal hours.
Date & Time guides
Guides, tips and worked examples for our free date & time. Every article links to the tool it explains.
How to Prepare for Ramadan: A Practical Checklist
A practical checklist to prepare for Ramadan: spiritual goals, health, sehri and iftar planning, budget, zakat, work schedules and family routines.
How to Calculate Age from Date of Birth (Years, Months, Days)
Learn how to calculate age from date of birth in years, months and days, by hand or with a free age calculator, including leap years and month-end birthdays.