Encode or decode date in 3 characters

I have developed a new way to encode/decode dates within 3 characters by using base-36 format.

What is a base 36 format?
Base 36 or hexatridecimal is a positional numeral system using 36 as the radix. The choice of 36 is convenient in that the digits can be represented using the Arabic numerals 0-9 and the Latin letters A-Z.

In simple language, base-36 format refers to series of 0-9 followed by A-Z characters, i.e., 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ; where each character refers to the position index in series.

The concept can also be represents as shown in the below table

Series	Character	Series	Character	Series	Character	Series	Character
0	0	10	A	20	K	30	U
1	1	11	B	21	L	31	V
2	2	12	C	22	M	32	W
3	3	13	D	23	N	33	X
4	4	14	E	24	O	34	Y
5	5	15	F	25	P	35	Z
6	6	16	G	26	Q
7	7	17	H	27	R
8	8	18	I	28	S
9	9	19	J	29	T

e.g., 12 → C, 19 → J, 34 → Y

Now here is a way to use the same logic for date, so to do that let us take a date and encode it as

25-Oct-2019 → 25-10-2019 → 25.10.19 → P.A.J → paj

Similarly, decode it back as

paj → P.A.J → 25.10.19 → 2019-10-25 → 25-Oct-2019

Note, here P.A.J is converted to lowercase as paj to make it more compact.