Delphi XE2 Foundations - Part 1 by Rolliston Chris

Author:Rolliston, Chris [Rolliston, Chris]
Language: eng
Format: epub
Published: 2012-06-13T20:00:00+00:00

Working with time periods (TTimeSpan)

The TTimeSpan type is for when you need to work with time durations rather than specific points in time. Declared in the System.TimeSpan unit, TTimeSpan is a record type whose instances hold a signed ‘ticks’ value (each tick is 1/10,000 of a millisecond). This value can then be read expressed in days, hours, minutes, seconds and milliseconds:

property Ticks: Int64 read FTicks;

property Days: Integer read GetDays;

property Hours: Integer read GetHours;

property Minutes: Integer read GetMinutes;

property Seconds: Integer read GetSeconds;

property Milliseconds: Integer read GetMilliseconds;

property TotalDays: Double read GetTotalDays;

property TotalHours: Double read GetTotalHours;

property TotalMinutes: Double read GetTotalMinutes;

property TotalSeconds: Double read GetTotalSeconds;

property TotalMilliseconds: Double read GetTotalMilliseconds;

Given a ticks value for a day and a half exactly, the properties of a TTimeSpan object will read as thus:

• Ticks will report 1,296,000,000,000 (10,000 x 1,000 x 60 x 60 x 24 x 1.5).

• Days will report 1.

• Hours will report 12.

• Minutes, Seconds and Milliseconds will all report 0.

• TotalDays will report 1.5.

• TotalHours will report 36.

• TotalMinutes will report 2,160 (60 x 24 x 1.5).

• TotalSeconds will report 129,600 (60 x 60 x 24 x 1.5).

• TotalMilliseconds will report 129,600,000 (1,000 x 60 x 60 x 24 x 1.5).

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