[#BloombergLP-bdlt-Date-operator_minus_eq]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/Date.adoc[Date]::operator‐=
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Assign to this object the value that is earlier 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.

== Synopsis

Declared in `<bdlt_date.h>`

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xref:BloombergLP/bdlt/Date.adoc[Date]&
operator‐=(int numDays);
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