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Functions TO_CHAR, TO_DATE and TO_TIMESTAMP convert between strings and date
values and accept 'yyyy' as part of the string format specification so the
function gets a hint that the text assumes dd/mm/yyyy format, yyyy-mm-dd or
whatever. These functions are unavaillable in the built-in HSQLDB 1.8

This is the documentation of the DATEDIFF function:

DATEDIFF ( <field>, <datetime value expr 1>, datetime value expr 2> )

<field> ::= 'yy' | 'mm' | 'dd' | 'hh' | 'mi' | 'ss' | 'ms' 

The function always rounds up to full integers stating that you are in your
73th year. Knowing this, you can calculate the common age (completed years)
with my little formula.
It gets the completed years from months divided by 12 and if the months are
the same it tests if the today is before or after the birthday.

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