AbstractDateTimeFormatter use DateTimeFormatter.ISO_OFFSET_DATE_TIME format
but this format ignore nanosecond if equals to 0
For example the format value will be 2024-01-10T15:45:25Z instead of 2024-01-10T15:45:25.000Z
As result, the summary mail in workspaces failed because one activity has been stored at 15:45:25.000 with the following error:

Caused by: java.text.ParseException: Unparseable date: "2024-01-10T15:45:25Z"
	at java.base/java.text.DateFormat.parse(DateFormat.java:399)
	at org.apache.cocoon.transformation.I18nTransformer.formatDate_Time(I18nTransformer.java:1983)
	... 98 more