а в справке про это написано!!!
Цитата:
TDateTime represents a date-and-time value in the Delphi language.
The integral part of a Delphi TDateTime value is the number of days that have passed since 12/30/1899. The fractional part of the TDateTime value is fraction of a 24 hour day that has elapsed.
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т.е. 1/24 = 1 час, 1/(24*60) = 1 мин, соотв. (1/(24*60))*25 = 25 мин.