Original Tomorrow-Overmorrow-Trimorrow System

Current version here.

Amount of Days Before After
1 Yesterday Tomorrow
2 Ereyesterday Overmorrow
3 Triesterday Trimorrow
4 Quadesterday Tetramorrow
5 Quintesterday Quinmorrow
6 Hexesterday Hexamorrow
7 Septesterday Septorrow
8 Octesterday Octarrow
9 Novesterday Nomorrow
10 Dekesterday Decmorrow
11 Elfesterday Elfmorrow
12 Dozesterday Dozorrow
13 Drazesterday Drazemorrow
14 Eptwinesterday Eptwinmorrow
15 Fimesterday Fimorrow
16 Texesterday Texmorrow
17 Septdekesterday Septdecmorrow
18 Octdekesterday Octadekarrow
19 Nodekesterday Nodecmorrow
20 Vegesterday Vegorrow
21 Univegesterday Univegorrow
22 Duvegesterday Duvegorrow
23 Trivegesterday Trivegorrow
24 Tetravesterday Tretravorrow
25 Quinvegesterday Quinvegorrow
26 Hexvegesterday Hexvegorrow
27 Septvegesterday Septvegorrow
28 Octvegesterday Octavegorrow
29 Novegesterday Novegorrow
30 Trigenesterday Trigenorrow
31 Trigelfesterday Trigelforrow