Converting 6 Jan 2021 21:19:42 GMT text into a date and time

f the format will always be consistent, you can create an expression rule to convert your string into a datetime.

a!localVariables(
  local!months: {
    "Jan",
    "Feb",
    "Mar"
  },
  local!string: "6 Jan 2021 21:19:42 GMT",
  local!date: trim(left(local!string, 11)),
  local!time: totime(trim(right(local!string,12))),
  local!year: right(local!date,4),
  local!day: trim(left(local!date,2)),
  local!month: wherecontains(trim(mid(local!date,3,4)),local!months),
  datetime(local!year,local!month,local!day,hour(local!time),minute(local!time),second(local!time))
)

Here is an alternative that uses regex if that's an option for you. The only reason I like this solution slightly better is that it can be modified to accept slightly different formats more easily. The downside is that I think regex will take slightly more time (very slightly more).

Just posting for other ideas in the future if people need them.

a!localVariables(
  local!userDateText: "6 Jan 2021 21:01:10 GMT",
  local!months: {
    "Jan": 1,
    "Feb": 2,
    "Mar": 3/*  Continue for all months  */

  },
  local!day: regexfirstmatch("^\d+", local!userDateText, "i"),
  local!month: index(
    local!months,
    regexfirstmatch("[a-zA-Z]{3}", local!userDateText),
    0
  ),
  local!year: regexfirstmatch("\d\d\d\d", local!userDateText, "i"),
  local!time: regexfirstmatch("\d+:\d+:\d+", local!userDateText, "i"),
  local!hour: split(local!time, ":")[1],
  local!min: split(local!time, ":")[2],
  local!sec: split(local!time, ":")[3],
  {
    datetime(
      local!year,
      local!month,
      local!day,
      local!hour,
      local!min,
      local!sec
    )
  }
)