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This is a known bug in Thuderbird:
https://bugzilla.mozilla.org/show_bug.cgi?id=1426907
I managed to get ISO dates by following the workaround in this comment:
https://bugzilla.mozilla.org/show_bug.cgi?id=1426907#c144
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Andrew David Wong (Axon)
Community Manager, Qubes OS
https://www.qubes-os.org
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