"Now, based on new information, we have revised that conclusion: The timezone offset was in fact GMT-4 (US Eastern DST). Here, we will describe how we arrived at this new, surprising conclusion and relate it to our prior work."
"We mistakenly interpreted the last modified time that LibreOffice wrote as “2015-08-25T23:07:00Z” as a GMT time value. Typically, the trailing “Z” means “Zulu Time“, but in this case, LibreOffice incorrectly added the “Z”."
"@ClimateAudit’s tests confirm that LibreOffice records the “last modified” time as local time (not GMT). The following section describes the method that we used to determine the timezone offset in force when the document was saved."
"We believe that in all three cases #Guccifer2 was unlikely to anticipate that this Eastern timezone setting could be derived from the metadata of the documents that he published..."