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

Return the day of the year of the date value indicated by the specified `serialDay`. The behavior is undefined unless `isValidSerial(serialDay)` returns `true`.

== Synopsis

Declared in `<bdlt_prolepticdateimputil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
int
serialToDayOfYear(int serialDay);
----


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