[#BloombergLP-balber-BerUtil_DateAndTimeHeaderImpUtil-isReserved]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balber.adoc[balber]::xref:BloombergLP/balber/BerUtil_DateAndTimeHeaderImpUtil.adoc[BerUtil_DateAndTimeHeaderImpUtil]::isReserved
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Return `true` if the specified `firstByte` of an encoded date‐and‐time value indicates it is in a format reserved for future use, and return `false` otherwise. Note that this may indicate the value was encoded incorrectly or using a newer version of this component.

== Synopsis

Declared in `<balber_berutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
isReserved(unsigned char firstByte);
----


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