[#BloombergLP-bdlt-ProlepticDateImpUtil-lastDayOfMonth]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/ProlepticDateImpUtil.adoc[ProlepticDateImpUtil]::lastDayOfMonth
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:mrdocs:

Return the last day of the specified `month` in the specified `year`. The behavior is undefined unless `1 <= year <= 9999` and `1 <= month <= 12`. Note that the value returned will be in the range `[28 .. 31]`.

== Synopsis

Declared in `<bdlt_prolepticdateimputil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
int
lastDayOfMonth(
    int year,
    int month);
----


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