EASA NAV(A)intermediate
Explain how to convert between local civil time and UTC when a UTC offset is provided.
Answer
If local time is UTC+n, subtract n hours to find UTC. If local time is UTC−n, add n hours to find UTC. Apply date changes when crossing midnight.
Explanation
The offset states how local time compares with UTC. For a positive offset, local time is ahead, so subtract the offset; for a negative offset, local time is behind, so add its magnitude. Always check whether conversion crosses midnight. **Key takeaway:** Interpret the sign of the offset before performing the conversion. **Glossary:** **UTC offset**: The signed number of hours between local time and UTC; **date change**: A change of calendar day caused by crossing midnight.
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