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Return the period (in years, months, days) between two dates
Source position: dateutil.inc line 277
procedure PeriodBetween( 
const ANow: TDateTime; 
const AThen: TDateTime; 
out Years: Word; 
out months: Word; 
out days: Word 
); 
PeriodBetween returns the timespan between 2 dates (ANow and AThen), expressed as a number of years, months and days in the parameters Years, months and days. Only complete years, months and days are reported.
If ANow is before AThen, their values are reversed so the result is always positive.

Calculate the number of whole years between two TDateTime values 


Calculate the number of whole months between two TDateTime values 


Calculate the number of whole weeks between two TDateTime values 


Number of whole days between two TDateTime values. 