Timezone and daylight saving questions

[angerhang]

I am parsing an array of GT3XPlus data with Firmware version of 2.3.0. I just have a few questions around time zone which I had a hard time finding the solutions to.

1. All the timestamps are encoded in UNIX time format but they are not UTC time right but rather the local time w.r.t. GMT?
2. How is daylight saving being indicated? I have two files, one in standard time and the other one in DST, however, the TimeZones in info.txt are the same for these two files. Shouldn't DST being reflected there, i.e. the DST file will have the an additional time offset?

[angerhang]

Just wondering if we have an update on this?

[angerhang]

To follow up, it would really be good to include time/zone information as things would be wrong when there is a day light saving. Or unless I am missing something that the devices can switch to the right time, when day light saving kicks in automatically.

See the related discussion here: wadpac/GGIR#580.

[izmirlig]

Correct me if I'm wrong, but in firmware prior to 2.5.0 has an "info.txt" file in the gt3x archive with the time-on time stamp, while the log.bin file containing all acceleration packets contains offsets to the original time stamp. Firmware after 3.1.0 has everything in a single file with rich format information in each data packet, with actual times in UTC timestamp. From: angerhang ***@***.***> Sent: Monday, June 13, 2022 7:04 AM To: actigraph/GT3X-File-Format ***@***.***> Cc: Subscribed ***@***.***> Subject: [EXTERNAL] Re: [actigraph/GT3X-File-Format] Timezone and daylight saving questions (#20) Just wondering if we have an update on this? - Reply to this email directly, view it on GitHub<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Factigraph%2FGT3X-File-Format%2Fissues%2F20%23issuecomment-1153778093&data=05%7C01%7Cizmirlig%40mail.nih.gov%7Ceca603ba59fa4127731908da4d2c7d91%7C14b77578977342d58507251ca2dc2b06%7C0%7C0%7C637907150722433548%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=PNjL8V%2BEt6vcnNrdYzxPiYqt%2FtCt123XWjxs1HoosNY%3D&reserved=0>, or unsubscribe<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FACTUYX5K2E4ECA6CFVIYASDVO4ITBANCNFSM4RY3O6IQ&data=05%7C01%7Cizmirlig%40mail.nih.gov%7Ceca603ba59fa4127731908da4d2c7d91%7C14b77578977342d58507251ca2dc2b06%7C0%7C0%7C637907150722433548%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=sMPYAlThEeRVK4w2JIHBvWDOliX4O78LROxuz3EqRtk%3D&reserved=0>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.******@***.***>> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and are confident the content is safe.