[#BloombergLP-bdlt-DatetimeInterval-addInterval]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/DatetimeInterval.adoc[DatetimeInterval]::addInterval
:relfileprefix: ../../../
:mrdocs:

Add to this time interval the specified number of `days`, and the optionally specified number of `hours`, `minutes`, `seconds`, `milliseconds`, and `microseconds`, and return a reference providing modifiable access to this object. Unspecified arguments default to 0. The behavior is undefined unless the resulting time interval value is valid (i.e., the days field must not overflow a 32‐bit integer). Note that the arguments may be supplied using a mixture of positive, negative, and 0 values.

== Synopsis

Declared in `<bdlt_datetimeinterval.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlt/DatetimeInterval.adoc[DatetimeInterval]&
addInterval(
    int days,
    xref:BloombergLP/bsls/Types/Int64.adoc[bsls::Types::Int64] hours = 0,
    xref:BloombergLP/bsls/Types/Int64.adoc[bsls::Types::Int64] minutes = 0,
    xref:BloombergLP/bsls/Types/Int64.adoc[bsls::Types::Int64] seconds = 0,
    xref:BloombergLP/bsls/Types/Int64.adoc[bsls::Types::Int64] milliseconds = 0,
    xref:BloombergLP/bsls/Types/Int64.adoc[bsls::Types::Int64] microseconds = 0);
----


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