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

Return the day of the week for the specified year, month, and day.

== Synopsis

Declared in `<bdlt_prolepticdateimputil.h>`

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

== 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`, `month`, and `day`. The behavior is undefined unless `isValidYearMonthDay(year, month, day)` returns `true`.

== Return Value

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

== Parameters

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


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