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

Return whether `year` and `dayOfYear` form a valid date.

== Synopsis

Declared in `<bdlt_posixdateimputil.h>`

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

== Description

Return `true` if the specified `year` and `dayOfYear` represents a valid date value, and `false` otherwise. Note that valid date values are (as fully defined in the component‐level documentation) in the range `[ 0001/01 .. 9999/365 ]` (except that `[ 1752/356 .. 1752/366 ]` are not valid for historical reasons).

== Return Value

`true` if valid, `false` otherwise

== Parameters

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


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