Spanish abbreviations of days of the week

Question

In English, the days of the week have single-letter abbreviations (M, T, W, etc.) and three-letter abbreviations (Mon., Tue., Wed.). What are the standard ways to abbreviate the days of the week in Spanish?

Answer 1

I don't know if there's any official standard about this, but:

The single-letter abbreviations are:

L, M, X, J, V, S, D

Note that miércoles is usually written as X, so as not to confuse it with martes.

Regarding múltiple letter abbreviations, the usual way is two-letter abbreviations:

Lu, Ma, Mi, Ju, Vi, Sa, Do

UPDATE:

A reference