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

Return the day of the week for the specified year and day‐of‐year.

== Synopsis

Declared in `<bdlt_prolepticdateimputil.h>`

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

== Description

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

== Return Value

day of week in `[1 .. 7]` (`1 = SUN` .. `7 = SAT`)

== Parameters

[cols="1,4"]
|===
| Name| Description
| *year*
| calendar year
| *dayOfYear*
| day of year
|===


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