current timezone  = CEST
current time      = Mon, 16 Sep 2019 12:24:00 +0200
METAR format      = 2019-09-16T12:24:00

Now the METAR format time 2019-09-16T12:24:00 will be displayed using different TZ formats

no extra TZ       = Mon, 16 Sep 2019 12:24:00 +0200 from unixtime: 1568629440 using this string: 2019-09-16T12:24:00
zulu time         = Mon, 16 Sep 2019 14:24:00 +0200 from unixtime: 1568636640 using this string: 2019-09-16T12:24:00Z
 utc time         = Mon, 16 Sep 2019 14:24:00 +0200 from unixtime: 1568636640 using this string: 2019-09-16T12:24:00 UTC
utc time          = Mon, 16 Sep 2019 14:24:00 +0200 from unixtime: 1568636640 using this string: 2019-09-16T12:24:00UTC