[#BloombergLP-bsls-TimeInterval-operator_plus_eq-054]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/TimeInterval.adoc[TimeInterval]::operator+=
:relfileprefix: ../../../
:mrdocs:

Add to this time interval the value of the specified `rhs` real number of seconds, and return a reference providing modifiable access to this object. The fractional part of `rhs`, if any, is rounded to the nearest whole number of nanoseconds before being added to this object. The behavior is undefined unless `rhs` can be converted to a valid `TimeInterval` object, and the total number of seconds in the resulting time interval can be represented with a 64‐bit signed integer.

== Synopsis

Declared in `<bsls_timeinterval.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bsls/TimeInterval.adoc[TimeInterval]&
operator+=(double rhs);
----


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