StartDriver.EffectiveDateSubtract property (Project)
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
| Name | Required/Optional | Data type | Description |
|---|---|---|---|
| Date | Required | Variant | Arbitrary date and time, for example, "7/10/2010" or "7/10/2010 2:00:00 PM". |
| Duration | Required | Variant | Duration 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.
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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