XPath 2.0 reference

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adjust-date-to-timezone

adjust-date-to-timezone($timezone)
     $timezone: xs:date
     returns: xs:date

Adjusts an xs:date value to a specific timezone, or to no timezone at all. If $timezone is the empty sequence, returns an xs:date without a timezone. Otherwise, returns an xs:date with a timezone. For purposes of timezone adjustment, an xs:date is treated as an xs:dateTime with time 00:00:00.

Example 1:

Input:	adjust-date-to-timezone(xs:date("2002-03-07"))
Output:	2002-03-07-05:00

Example 2:

Input:	adjust-date-to-timezone(xs:date("2002-03-07-07:00"))
Output:	2002-03-07-05:00

Example 3:

Input:	adjust-date-to-timezone(xs:date("2002-03-07"), $tz)
Output:	2002-03-07-10:00

Example 4:

Input:	adjust-date-to-timezone(xs:date("2002-03-07-07:00"), $tz)
Output:	2002-03-06-10:00

Example 5:

Input:	adjust-date-to-timezone(xs:date("2002-03-07"), ())
Output:	2002-03-07

Example 6:

Input:	adjust-date-to-timezone(xs:date("2002-03-07-07:00"), ())
Output:	2002-03-07

Locate in the official documentation

XPath 2.0 reference