[#BloombergLP-bdlt-LocalTimeOffset-LocalTimeOffsetCallback-08]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::xref:BloombergLP/bdlt/LocalTimeOffset.adoc[LocalTimeOffset]::LocalTimeOffsetCallback
:relfileprefix: ../../../
:mrdocs:

`LocalTimeOffsetCallback` is an alias for the type of a function that returns a `bsls::TimeInterval` value representing the difference between local time and UTC time at the specified `utcDatetime`. This function must be thread‐safe in multi‐threaded builds. Note that the installed callback function must have geographic information specifying the local timezone.

== Synopsis

Declared in `<bdlt_localtimeoffset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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typedef xref:BloombergLP/bsls/TimeInterval.adoc[bsls::TimeInterval](* LocalTimeOffsetCallback)(xref:BloombergLP/bdlt/Datetime.adoc[Datetime] const&);
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