Today (January 3rd) my password is HD82N.

On 07/01 (January 7th) my password should be IS42Y

On 12/01 (January 12th) my password should be AA91A

On 18/01 (January 18th) my password should be RR31U

On 24/02 (February 24th) my password should be VD40A

What was my password yesterday (January 2nd)?

Hint 1:

Firstly, did you notice how I spell my name each day.

Hint 2:

The days are numbered

Hint 3:

The week begins with monday

Hint 4:

I count and I reach the beginning but then I begin again from the beginning

Hint 5:

Each day ends with a day

Hint 6:

I look back at how many dates are left for the end

  • $\begingroup$ In what format is 12/01 (assuming it's relevant for the puzzle)? MM/DD or DD/MM? Additionally, if relevant, it might be worth adding the dates of "today" and "yesterday" for people looking at this post some time in the future. $\endgroup$ – Lolgast Jan 3 '18 at 15:51
  • $\begingroup$ @Lolgast DD/MM is the format, agreed let me update $\endgroup$ – Mehravish Temkar Jan 3 '18 at 15:51
  • $\begingroup$ I've taken the liberty of editing in the textual representation of the dates. If this alters the puzzle or is not relevant, or the dates are different due to timezone differences, feel free to revert/change my edit, although if it alters the nature of the puzzle you might want to add the wordplay tag. $\endgroup$ – Lolgast Jan 3 '18 at 15:56
  • $\begingroup$ The dates are right :) I don't know much about the tags here yet @Lolgast $\endgroup$ – Mehravish Temkar Jan 3 '18 at 15:58
  • $\begingroup$ You can have a look at the tags via one of the buttons on the top. While I don't think the wordplay is applicable (and I certainly do hope it's not), some beginning users might make a puzzle where the password is somehow based on the word "today" and "yesterday", rather than the specific dates. Such puzzles tend to be too broad and are generally not well received. $\endgroup$ – Lolgast Jan 3 '18 at 16:02

The first letter is the positional letter from

MEHRAVIS with the IS tagged in for Sunday

The second letter is the positional letter from

the day of the week where Mondays are M, Wednesdays are D

The number for the dates is the number or days

to the end of the month in reverse, 19 days left in the month is 91

The last letter is the positional letter from

The month where January makes the last letter for Sunday Y

Going by that rule the password for January 2nd is:


And likewise the password for January 4th is


And to clinch the approach the password for January 6th is


  • $\begingroup$ Impressive :) and the position is determined by the day of the week. Monday - 1 .. Sunday - 7 $\endgroup$ – Mehravish Temkar Jan 3 '18 at 19:55

This is a partial answer.

The first two letters:

I don't know yet. But I suspect they are derived from the week day of the date.

The number:

The origin of the number is of no importance; The number seems to be incrementing by 1 each day ($12 - 03 = 9 = 91 - 82$).
So the number for January 2nd is 81.

The last letter:

The last letter is the letter from "January" at index $N$ (in a rotating way) where $N$ is the day:

  ^ 3rd letter (N)
           ^ 12th letter (A)
 ^ 2nd letter (A)


The password for January 2nd is:


  • $\begingroup$ Nice try, you are right about the last letter. The index N is different though. Partially right about the first two letters. Nowhere close for the numbers. $\endgroup$ – Mehravish Temkar Jan 3 '18 at 17:56
  • $\begingroup$ Also, you are right about the repeating part of the words being used $\endgroup$ – Mehravish Temkar Jan 3 '18 at 19:12

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