Half Birthday Calculator

A half birthday is the day six calendar months after a birthday, and this tool works out exactly when it falls. Enter a birth date, and a year if you want a particular one, and it returns the date, the weekday, how many days away it is and the age reached on the day. Where the target month is too short for the day number, such as 31 August moving to February, the last day of that month is used instead. It also shows the other definition people use, the midpoint in days between one birthday and the next, which usually lands a day or two apart.