Разница во времени между GMT и UTC

{
  "pair": "GMT → UTC",
  "url": "https://worldclock.pro/ru/convert/gmt-to-utc",
  "from": {
    "name": "GMT",
    "type": "timezone",
    "abbreviation": "GMT",
    "daylightAbbreviation": "BST",
    "iana": "Europe/London",
    "standardUtcOffset": "+00:00",
    "daylightUtcOffset": "+01:00",
    "referenceCity": "London"
  },
  "to": {
    "name": "UTC",
    "type": "timezone",
    "abbreviation": "UTC",
    "daylightAbbreviation": null,
    "iana": "Etc/UTC",
    "standardUtcOffset": "+00:00",
    "daylightUtcOffset": null,
    "referenceCity": null
  },
  "currentDifferenceMinutes": 0,
  "possibleDifferencesMinutes": [
    -60,
    0
  ],
  "note": "Between the regions that use these zones the difference is 1 and 0 hours across the year, depending on daylight saving on each side. The clocks on this page show the named zones themselves, which are fixed."
}