BTW:
whatever your method does it always terminate with Quit $$$OK
so whatever happens it is equivalent to
set SphereJauh=1
I assume you look for a different return value ? Is it ?

your ClassMethod GetSphereJauh(Id..... is located in some Class

so just call it as any other class method
set SphereJauh=##class(classname).GetSphereJauh(ATTRDesc)  

the fact that this is used as part of a custom class query is totally irrelevant in this context.
it is straightforward ObjectScript. nothing else

Hi @Vivian Lee !
I think you had no chance to see the problem in docs
You mentioned a custom class that extends %Text.English
this might be the cause of your problem.
The class is not visible in normal class reference (don't ask me why) 
Default %Text.English has a Parameter  NOISEWORDS100 =
"the of and a to in is you that it he for was on are as with his they at be this from I have or by one had not but what all were when we there can an your which their said if do will each about how up out them then she many some so these would other into has more her two like him see time could no make than first been its who now my made over did down only way find use may long little very after called just where most know get through back";

So you might be affected by these NOISEWORDS.
I failed to find any useful public documentation on this parameter and also %Text.Text is not too useful

#1 is correct
Your calculation #2 is seriously wrong.
reason
reading documentation you see
dformat -2 

And that's the mistake:
Your BirthDate is obviously considered as  LOCAL time
And therefore the difference you see reflects the time offset of your machine to UTC
-19800 sec => -5.5 hrs
system variable $ZTZ will show your offset to UTC in minutes  => -330
my guess: your machine is running at local time in India
 

for $ZTDH:
https://docs.intersystems.com/iris20231/csp/docbook/DocBook.UI.Page.cls?KEY=RCOS_fzdatetimeh
for $ZDT:
https://docs.intersystems.com/iris20231/csp/docbook/DocBook.UI.Page.cls?KEY=RCOS_fzdatetime

USER>r x
1997-08-09 10:38:39.700000000
USER>w $ZDTH(x,3,,9)
57199,38319.7
USER>w $zdt($ZDTH(x,3,,9),3,7)
1997-08-09T08:38:39Z
USER>w $zdt($ZDTH(x,3,,9),3,7,9)
1997-08-09T08:38:39.700000000Z
USER>

win docker desktop not just consumes fast-growing  vhdx
but also a lot of temp files, that get never deleted or shrinked
not even with deinstall / reinstall
typically in 
C:\Users\<usename>\AppData\Local\Temp\docker-scout\sha256 
C:\Users\<username>\.docker\scout\sbom\sha256
C:\Users\<username>\AppData\Local\Temp\  *.ico, *.vhdx

in Caché it is %installdir%/mgr/cconsole.log
and you can see it from MgmtPortal
and it would be helpful if you uncover the primary language you use