Now, I know some people are scratching their heads wondering

"Wtf! What is Middas! Just Say Monday or something for Talos' Sake!"

This is just a quick little thing to help clear that up. It has Holidays, months, days of the week, and a few extra goodies : ).

Tamriel's year consists of 364 days, split into twelve months. Six months have 31 days, five have 30 days and one has 28 days. Very similar to how we mark the months.
The months along with some of the notable holidays are listed below (our monthly equivilent is listed in brackets beside them.)

Morningstar (January)
1st - New Life Festival
15th - South WInds Prayer

Sun's Dawn (February)
16th - Heart's Day

First Seed (March)
7th - First Planting

Rain's Hand (April)
28th - Jester's Day

Second Seed (May)
7th - Second Planting

Mid Year (June)
16th - Mid Year Celebration

Sun's Height (July)
10th - Merchants Festival
20th - Sun's Rest

Last Seed (August)
27th - Harvest's End

Heartfire (September)
3rd - Tales and Tallows

Frostfall (October)
13th - Witches Festival
30th - Emperor's Day

Sun's Dusk (November)
20th - Warriors Festival

Evening Star (December)
15th - North Winds Prayer
30th - Old Life Festival

The days are organized into a week seven days long. The days of the week are:

Sundas (Sunday)
Morndas (Monday)
Tirdas (Tuesday)
Middas (Wednesday)
Turdas (Thursday)
Freedas (Friday)
Loredas (Saturday)

The years are marked in eras. There have been three eras, The First Era, The Second Era, and the Third Era. Oblivion takes place in the Third Era. Anything before the First Era is refered to as the pre-era time, and it mostly concerned with the Ayleids. The year is usually read as whatever era it is from first, then how many years it is since the start of that era. For example, you asked about 3e433 in your question. That would be "3e" The Third Era, "433" Four hundred and thirty three years from the start of the Third Era.

So from the info above, you can see that the date you give last seed 31, 3e433 would be read as such.
The "3e" denotes that the date refers to the Third Era. The "433" means that it is Four Hundred and Thirty Three years from the begining of the Third Era. The date last seed 31, would indicate that it is the 31st day (and hence last day of) the month of Last Seed. The next day would be: Heartfire 1, 3e433.

This is rather common knowledge, but your work is recognized.

Doesn't this belong in Lore?

i am pretty sure that middas is wendesday.. morndas is monday.. i could be wrong thouh??

Yeah you could. But, whatcha going to do?

Not everyone knows this, and its nice information to have written out all in one spot. Thanks!

i ran some tests using my oblivion account, using NPCs schedules on my Strategy Guide. This info is 100% accurate

You.... wait, what?

Alternately, you could just go http://www.imperial-library.info/calendar/.

Simonp92 is right.

Morndas is Monday, Middas is Wednesday...

You do realise no one said otherwise, didn't you?

Does anyone?

Unless some people didn't read beyond the first paragraph of the original post...

i didnt

Well done for your amazing infomation gathering. I liked it.