I was wondering if there is a way to redefine the abbreviated months with datetime2 package, such that, when using the command \today, months are written exactly like the first column of the image below.


There is already a solution---How to make a lowercase month name with \today---with datetime package to redefine the month style, but this package creates a confit with my document.


enter image description here

EDIT in light of @quark67's solution:

I identified the conflict using quark67's solution to be with \usepackage[USenglish]{babel}, used for hyphenation. I just had to remove the argument [USenglish] to make quark67's solution works, but I would still like to keep \usepackage[USenglish]{babel}.


In reference to this post: Redefinition of \today -- Clash with babel, placing @quark67's code inside \AtBeginDocument{...} solved it.

  • Please add exactly the document class you need (ruthesis according to a comment) and all package you need to use. My answer needs adjustement for May, June and July. But what is false with the other months?
    – quark67
    Mar 11, 2023 at 7:36
  • I have updated my code. But I cannot guess what are the additional packages (which you mentioned in a comment) you uses, so perharps this code don't work for you.
    – quark67
    Mar 11, 2023 at 15:01
  • Thank you @quark67 for your help. This is the right solution that I was looking for. I have identified the conflict in \usepackage[USenglish]{babel} that I use for hyphenation. I just needed to remove the argument [USenglish]. I'm not sure how this will impact my document. Would you be able to work around this conflict?
    – AEW
    Mar 11, 2023 at 20:03

1 Answer 1


Try this (note the loading of the package datetime2-calc for the conversion from numeric value to the short month name).

Edit: As you say you need the document class ruthesis (https://scholarship.rice.edu/handle/1911/21747) in a comment, I update my code with this document class.

Also, as you have added a new requirement (June must be abbreviated as "June", no "Jun.", and July as "July", no "Jul."), I have updated the code (and corrected my dummy bug, May is never abbreviated as "May.")

Edit 2: "September" is abbreviated "Sept.", not "Sep.", as in the first column of the table.


     \ \DTMtwodigits{##3}, ##1}%


    \today % Mar. 11, 2023


enter image description here

In a comment, you say that the previous code don't work because of a package you uses, but you don't say which additional packages you uses, so I cannot guarantee this code will work in your real usage.

  • Thank you @quark67 for this solution, but for some reason, it is not working with my thesis document. It outputs: "March 10, 2023." I need to comply with IEEE standards. I think there is a conflict with this definition that I have: ` \def\@month{\ifcase\month ?\or \textsc{January}\or \textsc{February}\or \textsc{March}\or \textsc{April}\or \textsc{May}\or \textsc{June}\or \textsc{July}\or \textsc{August}\or \textsc{September}\or \textsc{October}\or \textsc{November}\or \textsc{December}\fi} `
    – AEW
    Mar 10, 2023 at 23:41
  • Welcome. Can you please provide an MWE? In your code, you uses the article document class. What is the real document class you uses? From where comes the definition \@month? Is it so in your preamble? Add also your required packages. Thanks.
    – quark67
    Mar 10, 2023 at 23:48
  • The document class that I'm using is report. It's different from my example, sorry. The definition of\@month? is in a .cls document. Do you know a quick way to copy a long code here, so you can check this document? Thanks.
    – AEW
    Mar 10, 2023 at 23:55
  • Here is the document class: newtextdocument.com/t/f9e9d1cfab
    – AEW
    Mar 11, 2023 at 0:25
  • @AEW I have downloaded ruthesis.cls from scholarship.rice.edu/handle/1911/21747 (seems to be the same version as yours), installed in ~/Library/texmf/tex/latex/ruthesis (on my Mac), then replaced \documentclass{article} by \documentclass{ruthesis} and all works as expected.
    – quark67
    Mar 11, 2023 at 1:09

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