What is the difference between UTC, GMT, and Zulu time?

All three refer to the same reference time with no offset. UTC is the international standard; GMT is the British equivalent; Zulu is the NATO/military designation. They're interchangeable for practical purposes.

How does Daylight Saving Time affect conversions?

DST is automatically accounted for based on the date. The US, most of Europe, and some other regions observe DST, which shifts the offset by +1 hour during summer months.

What is the International Date Line?

The International Date Line runs roughly along the 180° meridian in the Pacific. Crossing it eastward moves you back one calendar day; crossing westward moves you forward one day.

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