DB2 for z/OS UDF that converts a date that resides in 2 bytes into a YYYY-MM-DD date.
The origin of date in 2 bytes is from computing pre-history were every bit was precious.
It goes like that:
year in 7 bits
month in 4 bits
day in 5 bits
if year is < 50 add '20' in front of it
else add '19' in front.
(*) it makes use of two other UDFs - HEX2BIT & BIT2NUM
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