[#BloombergLP-bdlt-PosixDateImpUtil-ydToDayOfWeek]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/PosixDateImpUtil.adoc[PosixDateImpUtil]::ydToDayOfWeek
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:mrdocs:

Return, as an integer (with `1 = SUN`, `2 = MON`, ..., and `7 = SAT`), the day (of the week) of the date value indicated by the specified `year` and `dayOfYear`. The behavior is undefined unless `true == isValidYearDay(year, dayOfYear)`.

== Synopsis

Declared in `<bdlt_posixdateimputil.h>`

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


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