[#BloombergLP-bdlt-Date-operator_plus_eq]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/Date.adoc[Date]::operator+=
:relfileprefix: ../../../
:mrdocs:

Advance this date by the specified (signed) number of days.

== Synopsis

Declared in `<bdlt_date.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlt/Date.adoc[Date]&
operator+=(int numDays);
----

== Description

Assign to this object the value that is later by the specified (signed) `numDays` from its current value, and return a reference providing modifiable access to this object. The behavior is undefined unless the resulting value falls within the range of dates supported by this class (see `isValidYearMonthDay`). Note that `numDays` may be negative.

== Return Value

reference providing modifiable access to this object

== Parameters

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


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