[#BloombergLP-bdlt-Date-addDaysIfValid]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/Date.adoc[Date]::addDaysIfValid
:relfileprefix: ../../../
:mrdocs:

Add `numDays` if the result is a supported date; otherwise do nothing.

== Synopsis

Declared in `<bdlt_date.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
addDaysIfValid(int numDays);
----

== Description

Set this object to have the value that is later by the specified (signed) `numDays` from its current value, if the resulting value falls within the range of dates supported by this class (see `isValidYearMonthDay`). Return 0 on success, and a non‐zero value (with no effect) otherwise. Note that `numDays` may be negative.

== Return Value

0 on success, and a non‐zero value otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *numDays*
| signed number of days to add
|===


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