I’m wondering what is the time zone of the Sensing Start Time for a S1 GRD data.
S1tbx offers product properties where the times are defined and I’m missing the time zone information.
Best, Tomaž
according to this page, it is always given in UTC time
https://sentinels.copernicus.eu/web/sentinel/missions/sentinel-1/observation-scenario/acquisition-segments
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I am wondering the same. According to this page UTC is not a time zone, but a time standard https://www.timeanddate.com/time/gmt-utc-time.html
I have googled a bit but I can’t find the answer to which time zone is used
S1B_EW_OCN__2SDH_20190109T184126_20190109T184230_014421_01AD84_B6E1
according to this source, UTC is used:
https://sentinels.copernicus.eu/documents/247904/685211/Sentinel-2_User_Handbook
Also mentioned here: https://sentinel.esa.int/web/sentinel/user-guides/sentinel-2-msi/naming-convention
Yes I know UTC time format is used but what about the time zone?
Maybe I am understanding this incorrectly but as I understand it we only know year, month, date, hours, minutes and seconds but what about the time zone
YYYYMMDDTHHMMSSTZD Where
TZD = time zone designator (Z or +hh:mm or -hh:mm)
Coordinated Universal Time (abbreviated to UTC ) is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude,[1] and is not adjusted for daylight saving time.
…the adding of leap seconds as necessary will keep UTC within 1 second of mean solar time as stated above.
Ok now I get it thank you very much
I should have read my source better 
,Although GMT and UTC share the same current time in practice, there is a basic difference between the two"