formatDate timezones not supported

[mstevan]

@mstevan
test-set: format-date.xml, format-dateTime.xml, format-time.xml
test-cases: format-date-014 to format-date-027, format-dateTime-014 to format-dateTime-025e, format-time-014 to format-time-018

@team
Seems that timezones are not supported at all, please investigate

Input:
let $t := date("1985-03-01Z") return string-join( for $z in -28 to +28 return format-date(adjust-date-to-timezone($t,
         $z*dayTimeDuration("PT30M")), "[Z]"), " ")

Output:
⚠️ ️️here was an error.
 
Code: [FOFD1350] (this code can be looked up in the documentation and specifications).
 
Location information: file:/Users/mstevan/Documents/:LINE:1:COLUMN:78:
 
"[Z]": a component specifier refers to components that are not available in the date type

Expected output:
-14:00 -13:30 -13:00 -12:30 -12:00 -11:30 -11:00 -10:30 -10:00
-09:30 -09:00 -08:30 -08:00 -07:30 -07:00 -06:30 -06:00 -05:30 -05:00 -04:30
-04:00 -03:30 -03:00 -02:30 -02:00 -01:30 -01:00 -00:30 +00:00 +00:30 +01:00
+01:30 +02:00 +02:30 +03:00 +03:30 +04:00 +04:30 +05:00 +05:30 +06:00 +06:30
+07:00 +07:30 +08:00 +08:30 +09:00 +09:30 +10:00 +10:30 +11:00 +11:30 +12:00
+12:30 +13:00 +13:30 +14:00