mscroggs.co.uk
mscroggs.co.uk

subscribe

Blog

 2016-10-06 
Thanks to Marc, I noticed that today's date is a palindrome in two different date formats—DMMYY (61016) and DMMYYYY (6102016).
This made me wonder when there will be another date that is palindromic in multiple date formats, so I wrote a Python script to find out.
Turns out there's not too long to wait: 10 July 2017 will be palindromic in two date formats (MDDYY and MDDYYYY). But before that, there's 1 July 2017, which is palindromic in three date formats (YYMMD, YYMD and MDYY). Most exciting of all, however, is 2 February 2020, which is palindromic in 7 different formats!
The next palindromic dates are shown in the following table. It will update as the dates pass.
 \(n\) Next day with \(\geq n\) palindromic formatsFormats
12 February 2025YYYYMDD
22 May 2025YYMMD,YYMD,MDYY
32 May 2025YYMMD,YYMD,MDYY
42 March 2030YYYYMMDD,MMDDYYYY,YYYYMDD,MMDYY
51 January 2110DDMYYYY,YYMDD,DDMYY,MMDYYYY,MMDYY
61 January 2211YYMMD,DMYYYY,MDYYYY,YYMD,DMYY,MDYY
A full list of future palindromic dates can be found here.
                        
(Click on one of these icons to react to this blog post)

You might also enjoy...

Comments

Comments in green were written by me. Comments in blue were not written by me.
In some of your full list you use the same format forwards and backwards. I'm just questioning why are YYMDD,DDMYY considered to be different formats when they are palendromic.
Stee
                 Reply
 Add a Comment 


I will only use your email address to reply to your comment (if a reply is needed).

Allowed HTML tags: <br> <a> <small> <b> <i> <s> <sup> <sub> <u> <spoiler> <ul> <ol> <li> <logo>
To prove you are not a spam bot, please type "naidem" backwards in the box below (case sensitive):

Archive

Show me a random blog post
 2025 

Jan 2025

Christmas (2024) is over
Friendly squares
 2024 
▼ show ▼
 2023 
▼ show ▼
 2022 
▼ show ▼
 2021 
▼ show ▼
 2020 
▼ show ▼
 2019 
▼ show ▼
 2018 
▼ show ▼
 2017 
▼ show ▼
 2016 
▼ show ▼
 2015 
▼ show ▼
 2014 
▼ show ▼
 2013 
▼ show ▼
 2012 
▼ show ▼

Tags

chalkdust magazine wave scattering big internet math-off draughts fractals statistics the aperiodical javascript trigonometry numbers christmas card gather town talking maths in public royal baby guest posts map projections a gamut of games matrices zines matt parker squares finite group news craft matrix of cofactors matrix of minors dragon curves youtube palindromes bempp electromagnetic field gaussian elimination preconditioning estimation braiding final fantasy misleading statistics go noughts and crosses folding paper bots regular expressions european cup recursion cambridge light world cup geometry logo games crochet raspberry pi latex kings menace rhombicuboctahedron speed books fence posts edinburgh 24 hour maths computational complexity machine learning game of life london underground crossnumber error bars mean ucl propositional calculus royal institution phd martin gardner cross stitch matrix multiplication hannah fry logs video games pythagoras bubble bobble turtles standard deviation mathsjam folding tube maps flexagons game show probability pi approximation day approximation realhats signorini conditions football mathsteroids data frobel countdown anscombe's quartet runge's phenomenon harriss spiral reddit data visualisation nine men's morris friendly squares correlation sport weak imposition boundary element methods dates puzzles pizza cutting mathslogicbot manchester determinants reuleaux polygons simultaneous equations arithmetic hyperbolic surfaces pac-man binary wool people maths chebyshev programming hexapawn pascal's triangle geogebra hats accuracy probability python national lottery databet coins live stream golden ratio datasaurus dozen logic graph theory inline code newcastle plastic ratio bodmas polynomials interpolation finite element method numerical analysis dinosaurs sound weather station stickers php ternary london inverse matrices exponential growth christmas fonts oeis tennis sobolev spaces rugby captain scarlet advent calendar manchester science festival gerry anderson platonic solids radio 4 dataset triangles curvature golden spiral graphs pi chess errors quadrilaterals convergence asteroids sorting stirling numbers tmip

Archive

Show me a random blog post
▼ show ▼
© Matthew Scroggs 2012–2025