Yes. Conversions use the current UTC offsets for London (Europe/London) and Loonbeek (Europe/Brussels), which automatically account for whichever city is currently on daylight saving time. The answer is accurate right now; future dates can differ if either city crosses a clock change.

What time zone abbreviations do London and Loonbeek use?

London and Loonbeek each use their city's local abbreviation (such as CET or EST). The converter uses the current offset automatically, so you do not need to know the abbreviation.