Question 1

How do I calculate the number of days between two dates?

Accepted Answer

Subtract the earlier date from the later date. Each full day is 86,400 seconds. The calculator above does this instantly — enter both dates and it gives the total days, weeks, and the breakdown in years, months and days.

Question 2

What date is 90 days from today?

Accepted Answer

Enter today's date and 90 in the "add days" mode above for the exact answer. As a rough guide: 90 days is about 13 weeks, so three months from any date falls close to 90 days (February is the exception, making winter quarters shorter).

Question 3

What date is 30 days from today?

Accepted Answer

Use the add/subtract mode above with 30 days from today's date. Roughly, 30 days is one calendar month — though the actual date shifts by 1–3 days depending on which month you are in.

Question 4

How many days are in a year?

Accepted Answer

A standard year has 365 days. A leap year has 366 days. Leap years occur every four years (divisible by 4), except century years are only leap years if also divisible by 400 — so 2000 was a leap year, but 1900 was not. The next leap year after 2024 is 2028.

Question 5

Why do date calculations matter for UK employment?

Accepted Answer

Several UK employment rights are date-sensitive. Notice periods run from the day after notice is given. Statutory redundancy pay eligibility depends on continuous service calculated to the day. Fixed-term contracts and probation periods often specify a number of weeks or months, and the exact end date determines employment rights. The date calculator helps verify these precisely.

Question 6

How do I work out a date that is a certain number of working days away?

Accepted Answer

The calculator counts calendar days, not working days. To convert: divide the working days by 5 and multiply by 7 to get an approximate calendar day count, then adjust for any bank holidays in the period. For example, 10 working days ≈ 14 calendar days, subject to bank holidays.

Date Calculator — Days Between Dates and Add Subtract Days