Find examples for date intervals, working days, deadlines, elapsed time, and time zones. Use the date difference calculator, time zone converter, or age calculator. Calendar-day counts, overnight stays, and working-day counts can use different inclusion rules.
The age difference between siblings is the time between their birth dates. For an exact answer, compare the dates themselves rather than subtracting their current ages in whole years. Two children described as 6 and 3 may be separated by anything from a little over two years to almost four years.
To convert hours and minutes to decimal hours, divide the minutes by 60 and add the whole hours. 7 hours 30 minutes = 7 + 30 ÷ 60 = 7.50 hours. It does not equal 7.30 hours.
Six months does not have one fixed number of days. The exact total depends on the start date, the end date and whether February includes a leap day. For example, January 1 to July 1, 2026, is 181 elapsed days; July 1, 2026, to January 1, 2027, is 184.
To find how many days are left until your birthday, compare today’s calendar date with the next occurrence of your birthday. If this year’s date has already passed, use next year. For a live countdown, choose a specific time as well as the date.
A month-by-month 2026 working-day table, plus formulas for weekends, holidays, part-time schedules, and payroll planning.
Inclusive counting includes a boundary date; exclusive counting leaves it out. Use this guide to prevent common one-day errors.
Christmas Day 2026 falls on Friday, 25 December 2026. That part is fixed. What catches people out is everything stacked in front of it: posting deadlines, last delivery dates, the final payday, the we…
Twice a year, the offset between two cities can quietly change – and not always on the same calendar date in each place. A meeting scheduled with a fixed time-zone gap can drift by an hour for a few w…
A countdown to a wedding or an exam works because it happens once – you set it, watch it run down, and it’s done. Rent due on the 1st doesn’t work that way. Neither does a quarterly filing or a passpo…
Ask a calendar what week number it is and, depending on the system it’s using, you can get two genuinely different answers for the same date. That’s not a bug – there are multiple legitimate week-numb…
