https://bz.apache.org/bugzilla/show_bug.cgi?id=64143
Bug ID: 64143
Summary: Custom date formats rely on JVM user locale instead of
LocaleUtil in DataFormatter
Product: POI
Version: 4.1.1-FINAL
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: POI Overall
Assignee: dev@poi.apache.org
Reporter: jjlharri...@me.com
Target Milestone: ---
The DataFormatter class creates a new ExcelStyleDateFormatter for custom date
formatting which is a subclass of SimpleDateFormat. However, it never calls
setTimeZone which means it relies on the user.timezone and cannot be
overridden.
For the default date format, setTimeZone is called with the time zone from
LocaleUtil, which allows for the zone to be overridden on a per-thread basis.
I have a use case for reading formatted dates from an Excel file using as UTC,
but this only works if the JVM user.timezone is set to UTC, which I cannot
guarantee.
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