Date & Time Calculators

How many days between two dates — with the weeks, months, and working-day counts alongside.

The exact gap between two birthdays, in years, months, and days — and who is older.

Monday-to-Friday days between two dates, with the weekend and calendar totals to check it against.

Days from today to any date, broken into weeks, months and Monday-to-Friday business days.

Add or subtract years, months, weeks and days, in calendar days or business days only.

What weekday any date fell on, plus its day of year, ISO week, quarter and leap-year status.

Hours and minutes between two clock times, less an unpaid break, in decimal hours for payroll.

The ISO 8601 week number for any date, including the years where 1 January belongs to week 53.

Whether a year is a leap year, which rule decided it, and the nearest leap years either side.

A time in one city read in another, with the clock changes either side and the hours that do not exist.

Any time in military, 24-hour and 12-hour form at once — including the two hours the “add 12” rule gets wrong.

A week of punches totalled with breaks, overtime and pay — and a warning when a deducted break is legally paid time.

Overtime pay from the regular rate rather than the hourly wage — the difference a bonus makes.

Hours and minutes to decimal hours and back, with the seconds two decimal places quietly lose.

What a plan has actually banked, in hours and days — and how much the cap refused to bank.

The countdown to 25 December, with the weekday, the federal day off, and the Julian date.

Your animal from the date, not the year — with the element, the stem-branch pair, and both boundary conventions.

Six months on from a birthday — with the day-count reading beside it, because the two disagree.