Offsets are resolved for the local date entered, rather than treating the current offset as permanent. This matters around daylight saving transitions and when locations change rules on different dates.
The converter uses the IANA time-zone database available in the browser. A local clock time skipped during a spring-forward transition is reported as invalid instead of silently changing the requested time.
Questions
Paris to London FAQ
What is the time difference from Paris to London?
London is currently 1 hours behind Paris. City offsets can change with daylight saving time, so use the date-specific converter for another date.
How do I convert Paris time to London?
Choose the local date and time in Paris. The converter resolves that wall-clock time with Europe/Paris, then formats the same instant in Europe/London.
Does Paris to London change with daylight saving time?
It can. At least one selection uses date-aware city rules, and the two locations may start or end daylight saving time on different dates.