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Originally Posted by gsparks2
How do CC & Calibre determine if metadata needs updating on the device? Does it look at the time stamps of the file or does it do a detailed comparison between Calibre and CC?
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The driver in calibre compares the last_mod time from calibre's library to the last_mod time that CC received during the last connect. If they are different (larger or smaller) then the driver sends new metadata to CC.
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Do CC/Calibre use the same date-time when writing book files to the device?
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No. The timestamp of the format on the device is controlled entirely by Android.
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Reason I am asking: I was examining the files in the device folder and noticed that some of the files had times that were in the future. Not sure how that happened.
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Neither am I. As I said above, CC never directly sets the mod time for a file, instead depending on Android to take care of that when a file is created/opened for write. The implication is that during at least one connect the time on the device was not correct.
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Edit: both the device and pc date/times were set to the same time zone with network updates of time.
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While investigating your questions I did discover that CC is sending the file modtime as UTC but the driver in calibre was interpreting it in the local time zone. This means that the auto-format-sync feature might get confused for some time if a format is changed in calibre and immediately synced to CC. I can imagine situations where the file isn't sent for up to 12 hours, and others where the file is sent on every sync for up to 12 hours. I will submit the driver fix to Kovid.