Topics Section

One Digit Day Codes

In the somewhat unusual instance where a single digit day abbreviation is needed, the below codes can be used.

Code Day Note
M Monday  
T Tuesday Possible confusion with Thursday. Cannot use "S" to distinguish it from Thursday, because of confusion with Saturday or Sunday.
W Wednesday  
R Thursday Uses "R" to prevent confusion with Tuesday.
F Friday  
S Saturday The "S" is the best choice since "T" or "R" can be confused with other days.
U Sunday The letter "N" is a consonant in Monday, so the "U" is just the least-worst choice.


Three character day abbreviations (Mon-Sun) and two character abbreviations (Mo-Su) are well-known and unambiguous. A single-digit abbreviation is problematic because of Tuesday vs. Thursday and Saturday vs. Sunday, requiring the least-ambiguous letters, R and U for ThuRsday and SUnday respectively.

The application of these codes is fairly uncommon. The first time we saw them was in the late 80's on dot matrix printouts for M.I.T class schedules. Given the bandwidth, display and storage capacity of modern systems, the use of single-digit day abbreviations is no longer really needed. Lastly, displaying the codes in sequence starting on Monday, i.e. MTWRFSU, does give the reader a sense of what they are looking at without a decode key.

2-Digit Month Codes ISO 8601
ADV: Buy event tickets online!

Write Reviews ···> Earn Rewards Points
Write restaurant reviews and earn points that can be redeemed for great prizes.
Click Here For A Free Membership

© 1996-2013, | Privacy Policy | Terms and Conditions

EventGuide, EventGuide.Network, EventGuide Fort Lauderdale, VenueGuide and TheaterGuide are service marks of, Inc.
All other trademarks are the property of their respective owners.

All event information presented is subject to change. Please contact the event organizer directly to verify dates and times.

To list an event on (free): Click Here.
To report an inaccurate event listing: Click Here.