Ive ordered them from the least complicated, no-math method to the advanced and ominous-sounding Doomsday Algorithm.

Then, choose Assistant voice & sounds, and, under, Speech output tap Phone.

Now, choose None (unless hands-free).

Bet someone a beer that you might tell them the day of the week they were born instantly.

Sneak a look down at your phone and Siri/Google will have silently provided the answer you seek.

Collect your free drink.

It only requires a little memorization.

Heres how it works:

Look at a calendar and note what day the 7th falls on.

For August 2023, its Monday.

So you know its Monday on August 14th, 21st, and 28th too.

Commit to memory that August is a Monday month.

How many of these you’re able to remember really depends on your dedication.

When someone says What day of the week will it be on November 12?

you need only remember that November is a Tuesday month, so the 14th is a Tuesday.

Subtract down two and you know that November 12 is Sunday.

Add the day of the month to that.

Add the month code listed above.

If theres no remainder, its Saturday.

From 2000 to 2099, subtract 1 from the sum before dividing.

Add 7 to that to get 23.

Add the month code of 2 to get 25.

The remainder of 5 means it was a Thursday.

This method works after a fashion, but it lacks elegance.

Its a blunt instrument with arbitrary memorization.

Plus, it only works for dates going back until 1753.

So we need to go deeper.

These are the Doomsdays.

But you could also add other easy-to-remember days.

7/11, 11/7 and 9/5 and 5/9 also fall on that same weekday.

(A simple mnemonic equipment is to say, I work 9 to 5 at 7/11.)

In 2023, all these dates are Tuesdays.

Leap years make things a little more complicated.

Jan 3 is a Doomsday in a normal year.

In a leap year, its January 4.

In 2023, all the Doomsdays were Tuesdays.

So if someone asks what day was it on June 3, 2023?

you’re free to remember that 6/6 is a Tuesday, and subtracting 3 days gets you Saturday.

Its a little trickier in odd numbered months, but still doable.

But there are a number of methods for figuring that out.

Or readthe Wikipedia pagefor a lot more options.

Once you figure out the method that works for you, its possible to do in your head.