Date  Page  What changed 

#20100816  Number representations Times of day Bytes  First version on old website
Numeric representations had positional notation; English, Spanish, and German number names; scientific notation, Roman numerals, medieval numbers, sexagesimal, and upsidedown Times (now no longer linked) had factors, color, seconds, percent, vectors Bytes/charset had binary, hexadecimal, base64, ASCII/Latin1, UTF8, UCS2 (actually UTF16, but I didn't know JavaScript used UTF16) Original existed but wasn't linked anywhere 
#20100821  Bytes  Some explanation, UCS2 Little Endian, EBCDIC 
Text  New page; had normal, morse, and upsidedown  
#20100908  Times of day  Added Súiⱥcúili times 
#20131118  Number representations  Limited the length of unary numbers (to prevent crashes) 
Text  Added "Music" and transliterations section (Greek, Katakana, Hiragana), and some Caesar ciphers (rotn and atbash)
Added audio for Morse code Fixed bug where I switched & and ' in upsidedown  
#20131209  Time zones  New page; included various time zones and mean solar time (then called "sun time") 
#20131223  Vectors  New page 
#20131224  Number representations  Converting negative numbers to Spanish now says it's not supported rather than incorrectly converting to English 
Times of day  Fixed mixing up AM/PM  
#20140109  Functions  New page; allowed adding, subtracting, composing, and making parametric curves from lines, parabolas, and sine curves 
#20140314  Text  Added Devanagari transliteration 
#20140324  Functions  Added "custom expression" option (uses eval) 
#20140405  Measurements  New page; had lengths, SI prefixes, bits and bytes, angles, times, and frequencies 
#20140711  Phonetics  New page 
#20140714  Text  Added Klingon transliteration 
#20140730  Text  Added Cherokee and Hangul transliteration
Made the text boxes bigger Hopefully fixed Klingon's font (forgot to upload a file...) 
#20141011  Text  Added Soundex 
#20141111  Functions  Added more options (draw a function; multiply, divide, derivative, antiderivative) 
#20141124  Times of day  Allow entering a time, rather than just using the current time (I thought I'd already done that a long time ago...) 
#20150303  Number representations  Added fractions and English ordinals
Changed everything to use rational numbers. In case that causes problems, the previous version is still available. 
#20150501  "Everything" formula  New page 
Measurements  Added areas, volumes, and a few more lengths  
Bytes  Added MacRoman  
#20150517  Number representations  Added factorial base (and recursive factorial) 
Measurements  Added unusual and astronomical lengths
Added petahertz, exaherts, tempo markings, note names, audio, and timebased frequency units Added an option to add/subtract/multiply/divide/raise to a power the current number Added more specific sources in the footer  
#20150708  Dates  New page 
Measurements  Added temperature  
Number representations  Added Fouriest transform, Chinese numbers, and more buttons to change the current number  
Times of day  Removed the link, since most of it is just arbitrary stuff using the numbers in the time  
#20150804  First version on chridd.nfshost.com  
Number representations  Added factors  
#20150916  Time zones  Changed "sun time" to "mean solar time", since I think that's more accurate to what I was actually calculating. 
#20150920  "Everything" formula  Added a reset button and buttons to perform mathematical operations on y 
#20150922  Added a description to the top of the main page  
#20150930  Measurements  Added a picture to the angle section and the "ngon" subsection
Added other temperature units to the temperature differences section (including Planck temperature) 
#20151111  Bytes  Changed labels from saying "UCS2" to "UTF16" and added a note that the UTF8 conversion wouldn't work for some characters, because I hadn't realized before that JavaScript strings were UTF16 
Changed titles of a bunch of things  
#20151208  Dates  Made the Gregorian calendar work with older dates and added the Julian calendar and Julian day 
#20160125  Latitude/longitude distance  New page 
#20160201  Kaufman decimals  New page 
#20160315  Phonetics  Increased the height for the IPA text field 
#20160323  Number types  New page; had real numbers, complex numbers, quaternions, and ordinals 
#20160408  Number types  Added IEEE floating point, extended real number line, projective real number line, and cardinals 
#20160422  Changed external links from http: to https: throughout my site whenever possible  
#20170615  Number representations  Added quote notation, Fibonacci coding, and continued fractions
Changed the ordinary positional notation section to allow each row's options to be changed (instead of having everything be fixed and just one "other" row) Moved sexagesimal to the ordinary positional notation section and made it so any base above 36 will act like sexagesimal Removed "upside down" (which was just calculator writing) 
#20170912  Number types  Added padic numbers, modular arithmetic, and 2element boolean algebra
Added square roots Switched the precedence of multiplication and division Added the ability to post comments 
#20171002  Number types  Added natural numbers, integers, splitcomplex numbers, dual numbers, the circle group, and supernatural numbers
Added the ability to see multiple number types at once Added logbase, absolute value, complex conjugate ( conj ), gcd, and lcm operators, and e_n notation for entering complexlike numbers

#20171201  Measurements  Added some less serious temperature systems (Felsius, radians C, radians F)
Fixed the spelling of "Celsius", which apparently has an "s" and not another "c". Added the ability to post comments 
#20171201  Measurements  Changed it to use rationals internally, which should hopefully make rounding errors less common 
#20181112  Measurements  Added °M
Fixed the spelling of Felsius 
#20181202  Reorganized my site so most of this is available from the new math page (changed breadcrumbs, added a note about the reorganization).
Added the ability to post comments to many/all(?) pages  
#20191207  Number types  Made multiplication and division the same precedence 
#20200607  Added this version history page
Changed xkcd forum links to point to the web archive :(  
Bytes  Made UTF8 work for characters over U+10000 and added UCS4 