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Category: Date math

How Many Days Are Left in the Year? Days, Weeks and Months How many days are left in the year today, plus weeks, months and the percentage of the year gone, with a month-by-month table and the leap year effect. Read → What Day of the Week Was I Born? How to Work It Out Find the weekday of any birth date in your head with the doomsday rule, step by step with worked examples, or get it instantly with our tool. Read → What Date Is 90 Days From Today? Visas, Notice Periods and More See the date 90 days from today, plus 30, 60, 120 and 180 days, and learn how visa rules like Schengen 90/180, notice periods and return windows count days. Read → Week Numbers Explained: What Week Is It Today? Find today's week number and learn the ISO 8601 rules: Monday-start weeks, week 1 and the first Thursday, 53-week years and how US numbering differs. Read → Leap Years: The Rule, the Exceptions and the Next One The leap year rule explained: divisible by 4, except centuries unless divisible by 400. Why 1900 was not a leap year, February 29 birthdays and the next ones. Read → Excel and Google Sheets Formulas for Days Between Dates The spreadsheet formulas for date math: subtracting dates, DATEDIF, NETWORKDAYS, WORKDAY, EDATE, TODAY, WEEKNUM and ISOWEEKNUM, with worked examples. Read → What Is a Fortnight? Meaning, Uses and Examples A fortnight is 14 days, or two weeks. Where the word comes from, fortnightly vs bimonthly, 26 fortnightly paydays a year and dates of the next fortnights. Read → How to Count the Days Between Two Dates Count the days between two dates by hand: inclusive vs exclusive counting, month lengths, the knuckle trick and worked examples with real dates. Read → How to Count Business Days (Excluding Weekends and Holidays) How to count business days between dates or from today: skip weekends and public holidays, handle different weekends, and see a ready-made table. Read → How to Calculate Your Age for Job and Exam Forms How to work out your age as on a closing date for job and exam forms in Pakistan, using the years, months and days method, with worked examples. Read →