[Overview][Constants][Procedures and functions][Index] |
Calculate the approximate number of years between two TDateTime values.
Source position: dateutil.inc line 284
function YearSpan( |
const ANow: TDateTime; |
const AThen: TDateTime |
):Double; |
ANow |
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First moment in time |
AThen |
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Second moment in time |
Number (fractions included) of years between ANow and AThen
YearSpan returns the number of years between ANow and AThen, including any fractional parts of a year. This number is an approximation, based on an average number of days of 365.25 per year (average over 4 years).
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Calculate the approximate number of months between two TDateTime values. |
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Calculate the approximate number of weeks between two TDateTime values. |
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Calculate the approximate number of days between two TDateTime values. |
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Calculate the approximate number of hours between two TDateTime values. |
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Calculate the approximate number of minutes between two TDateTime values. |
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Calculate the approximate number of seconds between two TDateTime values. |
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Calculate the approximate number of milliseconds between two TDateTime values. |
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Calculate the number of whole years between two TDateTime values |
Program Example63; { This program demonstrates the YearSpan function } Uses SysUtils,DateUtils; Procedure Test(ANow,AThen : TDateTime); begin Write('Number of years between '); Write(DateToStr(AThen),' and ',DateToStr(ANow)); Writeln(' : ',YearSpan(ANow,AThen)); end; Var D1,D2 : TDateTime; Begin D1:=Today; D2:=Today-364; Test(D1,D2); D2:=Today-365; Test(D1,D2); D2:=Today-366; Test(D1,D2); D2:=Today-390; Test(D1,D2); D2:=Today-368; Test(D1,D2); D2:=Today-1000; Test(D1,D2); End.