# What if someone was born on the 29th on a leap year?

What will they do on the non-leap year years?

This is a serious attempt to explain what happens to ALL OF US when (we think) we are celebrating our birthdays on the correct dates:

We do not really celebrate our "birthDAY" either: (a) as a day of the week, as that would give us 52 or 53 birthdays per year; or (b) as a DDay of the month, as that would give us between 7 and 12 birthdays per year

We actually (intend to) celebrate the "anniversaries of our birth" (once per year), and since one year is not an exact whole number of days, we all have a significant probability of celebrating (the anniversary of) our birth on the wrong date.

I believe I am correct in stating that: our modern calendar is based on the "sidereal year" in which one year is 365.256260417 days, or 52 weeks, 1 day 6 hours 9 minutes 9.54 seconds.

..... thus when we change the year number (YYYY→YYYY+1 ) after 365 days, we do so about 6 hours too soon, then we add an extra "leap day" (usually) once every four years to give a reasonably accurate correction to the annual date-time system.

Let's say (for example): your friend George was born on Saturday 01 January 2000 at exactly midday; you were born on Tuesday 29 February 2000 at exactly midday; and your friend Trisha was born on Friday 31 March 2000 at exactly midday.

Refer to the image posted above:

These are the EXACT TIMES that each of you SHOULD celebrate the anniversaries of your births (as calculated by Microsoft © Excel ® spreadsheet).

Note that, because the calendar year changes about 6 hours "too early", for the first few years of your lives, the EXACT anniversaries of your births occur a little more than six hours later in the day 365 days after the previous "birthday" ..... which is not necessarily on the same "DD-MM" date that you were actually born on.

Eventually, an extra leap day is added into the calendar to correct for the gradually increasing date-time errors that were mounting up, and after that leap-day has been inserted you will all then find the EXACT date-time of your anniversaries will appear at a somewhat earlier time in the conventional calendar, before subsequently creeping upwards again at a rate of roughly 6 hours per year.

So I guess we all end up celebrating our "Birthday" anniversary on the wrong date a lot of the time.

It depends what units you are measuring the "2" in. There are many alternative units used to express the age of something, including "days" and "months". Qu. Does that mean that a baby who is two months old is also 60? Ans - perhaps, but only if the 60 is measured in days. Someone who is eight years old might similarly be 2 in some unspecified system of units. If you measure someone's age in terms of the number of 29 Februarys that have occurred during their lifetimes and express that unit as "Leaps", then someone who is eight years old could also be said to be two Leaps old. No different really than saying a baby who is twelve months old is also one. The moral being where units of measurement CAN be used to express something, the unit itself MUST be specified, or understood by implication, otherwise the number by itself is meaningless.

They would be Pisces [ ♓ - Feb. 19 to March 20 ]

Favourable Points: Compassionate; Adaptable; Accepting; Devoted; Imaginative. Weaknesses: - Oversensitive; Indecisive; Self-pitying; Lazy; Escapist.

Today: You will feel quietly confident about your latest project, but avoid pressing ahead with it too rapidly, as an unexpected dark haired acquaintance will arrive soon and provide valuable assistance using facilities and techniques you are unaccustomed to.

..... and for anyone still interested in reading further into the future,

Tomorrow: You should be struck by an unforeseen shock, delivered by a dark haired acquaintance who is aware of the fact that you need some sense knocking into you with a large mallet.

-- The all-seeing, all-knowing - Mystic Meg

I happen to know 2 people born that day. Nothing. They just celebrate either on the 28th or on the 1st of March.