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

Return the number of leap years occurring between the specified `year1` and `year2`, inclusive. The behavior is undefined unless `1 <= year1 <= 9999`, `1 <= year2 <= 9999`, and `year1 <= year2`.

== Synopsis

Declared in `<bdlt_prolepticdateimputil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
int
numLeapYears(
    int year1,
    int year2);
----


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