current timezone  = CET
current time      = Sun, 19 Jan 2020 17:12:28 +0100
METAR format      = 2020-01-19T17:12:28

Now the METAR format time 2020-01-19T17:12:28 will be displayed using different TZ formats

no extra TZ       = Sun, 19 Jan 2020 17:12:28 +0100 from unixtime: 1579450348 using this string: 2020-01-19T17:12:28
zulu time         = Sun, 19 Jan 2020 18:12:28 +0100 from unixtime: 1579453948 using this string: 2020-01-19T17:12:28Z
 utc time         = Sun, 19 Jan 2020 18:12:28 +0100 from unixtime: 1579453948 using this string: 2020-01-19T17:12:28 UTC
utc time          = Sun, 19 Jan 2020 18:12:28 +0100 from unixtime: 1579453948 using this string: 2020-01-19T17:12:28UTC