The `gmtime()` function returns the given epoch timestamp (or now,
   if omitted) as a dictionary containing broken-down date and time
   information interpreted as UTC time.
   
   -- Testcase --
   {%
           let t = time();
           let d1 = gmtime();
           let d2 = gmtime(1647953502);
  
          // assert that localtime without epoch returns the current time
          let c = timegm(d1);
          assert(c >= t && c <= t + 5, "gmtime() result does not match time()");
  
          // dump fixed time and check expected output
          printf("%.J\n", d2);
  %}
  -- End --
  
  -- Expect stdout --
  {
          "sec": 42,
          "min": 51,
          "hour": 12,
          "mday": 22,
          "mon": 3,
          "year": 2022,
          "wday": 2,
          "yday": 81,
          "isdst": 0
  }
  -- End --

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