The hour offset is checked to be at most `11` here: https://github.com/sbmlteam/libsbml/blob/226c8674bdfb5b28ac58b0b2046a44f2f8781bfd/src/sbml/annotation/Date.cpp#L648 This prevent representing some time zones, for example [LINT](https://www.timeanddate.com/time/zones/lint) is UTC+14 and [AoE](https://www.timeanddate.com/time/zones/aoe) is UTC-12. Would you be interested by a patch fixing this?