Date Midpoint Calculator

Try an example

• The middle of 2026: July 2, 2026, a Thursday.
• The middle of the Second World War in Europe (September 1, 1939 to May 8, 1945): July 5, 1942.
• Halfway between the Moon landing and October 18, 2026: March 4, 1998.
• Halfway between the death of Julius Caesar and the fall of the Western Roman Empire (March 15, 44 BC to September 4, AD 476): December 9, AD 216.

What day is halfway through the year?

In a regular year of 365 days, the middle of the year is July 2. It is day 183, with 182 days before it and 182 days after it, and the exact halfway moment is noon that day.

A leap year has 366 days, so no single day sits in the middle. The year divides evenly at midnight as July 1 ends and July 2 begins, with 183 days on each side. Enter January 1 and December 31 of a leap year and the calculator shows July 1 and says the middle falls between July 1 and July 2.

To find the middle of a month, enter its first and last days. In a 31-day month such as October, the middle is the 16th, with 15 days on each side. In a 30-day month such as September, it falls between the 15th and the 16th.

How the midpoint is worked out

The calculator counts the days between the two dates and steps forward half that many days from the earlier one. The order you enter the dates in does not matter. To find the weekday of a single date, use the day of the week calculator.

When the two dates are an even number of days apart, the midpoint is a single day. When they are an odd number of days apart, the exact middle is noon between two days. The calculator shows the earlier of the two and says so.

Dates BC

Choose BC in the era box for any date before AD 1. There is no year zero: 1 BC is followed directly by AD 1, and the calculator counts across that boundary correctly. To count whole years between a year BC and a year AD, use the BC/AD years calculator.

Every date uses the Gregorian calendar, extended back before it was adopted in 1582. Historians often give older dates in the Julian calendar instead. The two calendars agree in the third century AD and drift apart in both directions from there: the Julian calendar is ten days behind by the 1500s and two days ahead by the time of Julius Caesar. So a midpoint between two ancient dates can differ by a few days from one worked out in the Julian calendar.

Seeing more than two dates

A midpoint is one way to see where a moment sits in a longer span. When you have more than a couple of dates, Preceden can put them on a timeline, so the gaps and overlaps are easy to see.