Hi.

When I choosed "ko-KR" in dateTimeToText, then was not worked Custom Format.

It's only returned "yyyy-MM-dd"

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Sorry.
My Question was not enough.

I selected 'ko-KR' in design mode,
Automatically insert double quotation marks at both side.

As far as I know This was only happen select "ko-KR".
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defVar --name dateAndTime --type DateTime --value "2019-08-05 12:18:18"
defVar --name dateTimeText --type String
defVar --name CustomFormat --type String --value "yyyy/MM/dd"
dateTimeToText --culture "ko-KR" --date "${dateAndTime}" --usecustomformat  --customformat "${CustomFormat}" dateTimeText=value
logMessage --message "${dateTimeText}" --type "Info"

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donghyun shin
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Hi, the runtime is based on Microsoft's implementation of globalization. This seems an odd behavior, but there's a reason why. This question was raised here as well.
Basically, the forward-slash means to use the "system date separator", which is "-' in Korean. To overwrite this behavior, just escape the slash with single-quotes, like in the code below:

defVar --name dateAndTime --type DateTime --value "2019-08-05 12:18:18"
defVar --name dateTimeText --type String
defVar --name CustomFormat --type String --value "yyyy\\MM\\dd"
dateTimeToText --culture "ko-KR" --date "${dateAndTime}" --usecustomformat  --customformat "yyyy\'/\'MM\'/\'dd" dateTimeText=value
logMessage --message "${dateTimeText}" --type "Info"

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Joba Diniz
Product Manager
IBM
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