fix(core): Fix integer overflows in datetime handling
fix(core): Fix integer overflows in datetime handling

JGrothoff/open62541,jpfr/open62541,jpfr/open62541,JGrothoff/open62541,jpfr/open62541,StalderT/open62541,StalderT/open62541,JGrothoff/open62541,open62541/open62541,open62541/open62541,open62541/open62541,StalderT/open62541,StalderT/open62541,open62541/open62541,jpfr/open62541,JGrothoff/open62541