This should display 'Tue':

new SimpleDateFormat("EEE").format(new Date());

This should display 'Tuesday':

new SimpleDateFormat("EEEE").format(new Date());

This should display 'T':

new SimpleDateFormat("EEEEE").format(new Date());

So your specific example would be:

new SimpleDateFormat("yyyy-MM-EEE").format(new Date());
Answer from Nathan Feger on Stack Overflow
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Microsoft Support
support.microsoft.com › en-us › office › show-dates-as-days-of-the-week-14f02f1d-8e3d-45a5-bdf8-3d962bf15327
Show dates as days of the week - Microsoft Support
Under Category, click Custom, and in the Type box, type dddd for the full name of the day of the week (Monday, Tuesday, and so on), or ddd for the abbreviated name of the day of the week (Mon, Tue, Wed, and so on). To do this task, use the TEXT function. Copy the following data to a blank worksheet.
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Google Support
support.google.com › docs › thread › 203580550 › how-do-i-specify-a-custom-date-format-including-day-of-week
how do I specify a custom date format including day of week? - Google Docs Editors Community
Skip to main content · Google Docs Editors Help · Sign in · Google Help · Help Center · Community · Google Docs Editors · Terms of Service · Submit feedback · Send feedback on
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ExtendOffice
extendoffice.com › documents › excel › how to format date to show abbreviated day of week or month in excel?
How to format date to show abbreviated day of week or month in Excel?
To display dates as abbreviated day of week (e.g., "Mon", "Tue"), type DDD. To show abbreviated months (e.g., "Jan", "Feb"), type MMM. If you only want the first initial (e.g., "F" for Friday, or "J" for January), Excel’s built-in format doesn’t support single-letter abbreviations for days ...
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Microsoft Power BI Community
community.powerbi.com › t5 › Power-Query › Date-format-to-show-day-of-the-week › td-p › 2774507
Date format to show day of the week - Microsoft Power BI Community
September 17, 2022 - I want to create a date column that shows date format in this form ddd /mm/dd/yyyyy hh :mm basically should show day of the week , month, date, year and time ... I see two options.
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Readle
readle-app.com › en › blog › how-to-write-dates-in-english
Save the Date: Write Dates in English Correctly | Readle
April 13, 2022 - This way, the same date, January 5th, would be written as 01/05/2022. Another way to write the date in English is to add the day of the week first, followed by the day and then the month.
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BeginnersBook
beginnersbook.com › 2017 › 10 › java-date-format-to-display-the-day-of-the-week
Java – Date Format to display the Day of the week
import java.util.Date; import java.text.SimpleDateFormat; public class Example { public static void main(String[] args) { /* The pattern "EEE" for Day of the week in short form * such as "Mon", "Tue", "Wed" etc. */ SimpleDateFormat sdf = new SimpleDateFormat("EEE"); String stringDate = sdf.format(new Date()); System.out.println("Today is: "+stringDate); /* The pattern "EEEE" for Day of the week in full form * such as "Monday", "Tuesday", "Wednesday" etc.
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Enchanted Learning
enchantedlearning.com › calendar › writingthedate
Writing a Date (US format) - EnchantedLearning.com
As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages. Click here to learn more. ... Short Format: Month date, year Sometimes, a date is written like this: June 28, 2015 (note that there is a comma after the day, but not after the month). Long Format: Day, Month date, year Sometimes, a date is written in long form, like this: Sunday, June 28, 2015 (note that there are commas after the day of the week and the day of the month, but there is no comma after the month).
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Wikipedia
en.wikipedia.org › wiki › List_of_date_formats_by_country
List of date formats by country - Wikipedia
3 days ago - Writers have traditionally written ... 10/03/2026, 10-03-2026 or 10.03.2026) and month–day formats such as "March 10, 2026" (03/10/26 or 03/10/2026). This can result in dates that are impossible to understand correctly without knowing the context....
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Grammarly
grammarly.com › blog › writing-tips › how-to-write-dates
How to Write Dates Correctly | Grammarly
July 1, 2023 - In British English, ordinals can ... of May. Daniel was born on the thirteenth. When writing a long-form date, use a comma after days of the week to ensure ......
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Wikipedia
en.wikipedia.org › wiki › ISO_8601
ISO 8601 - Wikipedia
1 week ago - The separator used between date values (year, month, week, and day) is the hyphen, while the colon is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or as "20090106" in the basic format without ambiguity.
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Unicode
cldr.unicode.org › translation › date-time › date-time-patterns
Date/Time Patterns
era - year - month - day - day-of-week - hour - minute - second · Each numeric field should be consistently 2 digits: MM, dd, HH, hh, mm, ss · Each string field should match the Code in width: G, MMM, MMMM, E, EEE · But should use a different letter for stand-alone vs. formatting as needed. It is helpful to have a second window up showing the Date & Time / Gregorian equivalents, so that you can be consistent (except for ordering) with the Gregorian calendar.
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Golden Software
surferhelp.goldensoftware.com › gscomlib › Date_Time_Formats.htm
Date Time Formats
Days are shown as d, dd, ddd, or dddd. Hours are shown as h, hh, H, HH, or [h]. Minutes are shown as m, mm, or [mm]. Seconds are shown as ss, ss.0, ss.00, ss.000, ss.0000, or [ss]. AM/PM designation is shown as tt or TT. BC/AD designation is shown as gg or GG.