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StartDriver.EffectiveDateSubtract Property (Project)

office 365 dev account|Last Updated: 6/12/2017
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Gets the date and time that precedes another date by a specified duration, using the effective calendar for a manually scheduled task. Read-only Variant.

Syntax

expression. EffectiveDateSubtract( ** Date, ** Duration )

expression An expression that returns a StartDriver object.

Parameters

NameRequired/OptionalData TypeDescription
DateRequiredVariantArbitrary date and time, for example, "7/10/2010" or "7/10/2010 2:00:00 PM".
DurationRequiredVariantDuration to subtract, for example, "3d" or "2w".

Remarks

The EffectiveDateSubtract property uses the effective calendar for manually scheduled tasks, which allows tasks to start and finish on non-working times. The property and arguments have no effect on actual task dates.

You can use the EffectiveDateSubtract, EffectiveDateAdd, and EffectiveDateDifference properties to calculate start and finish dates for manually scheduled tasks.

To calculate a date for an automatically scheduled task, where you can also specify the calendar, use the DateSubtract method.

Example

The following statement returns the value "6/24/2009 8:00:00 AM", which is six days before the specified date.

Debug.Print ActiveProject.Tasks(3).StartDriver.EffectiveDateSubtract("7/2/2009", "6d")
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