Fit Timestamp Conversion

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19 December 2012 03:39 AM

adambird Newbie

Total Posts: 3

Joined 2012-12-19

Hi, complete newbie question here could someone explain how I should convert a timestamp into a Time. I'm guessing that I need to add the value, eg 705738584 (secs?) to a reference time.

I'm not dealing with a compressed timestamp as the record header doesn't indicate it.

I've tried reviewing the docs but must be missing this.

Thanks in advance,

Adam

19 December 2012 06:33 AM #1

old_man_biking Sr. Member

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Here's the code snippet from my software:

// fit_profile.hpp: "seconds since UTC 00:00 Dec 31 1989"
private static readonly DateTime RefDateTime = new DateTime(1989, 12, 31, 0, 0, 0, DateTimeKind.Utc);
protected static Nullable<DateTime> ToDateTime(UInt32 dateTimeValue)
{
    if (dateTimeValue != FIT_UINT32_INVALID)
        return RefDateTime.AddSeconds(dateTimeValue);
    else
        return null;
} 

19 December 2012 07:30 AM #2

adambird Newbie

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Joined 2012-12-19

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Awesome, thanks.

Intrigued as to why 00:00 Dec 31 1989 is the reference time, do you know it's significance?

19 December 2012 07:36 AM #3

old_man_biking Sr. Member

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Afaik, it's the birthdate of the Dynastream CEO's first cat

Seriosly: they HAVE to assume a certain base date. Unix has Jan 1, 1970, Excel Dec 12, 1899 and there are lots of others for sure.

19 December 2012 07:37 AM #4

adambird Newbie

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Joined 2012-12-19

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understand the need for it, just wondered why. Thanks for your help

19 December 2012 11:45 AM #5

alejandra Moderator

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Joined 2012-10-09

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old_man_biking - 19 December 2012 07:36 AM
Afaik, it's the birthdate of the Dynastream CEO's first cat ;-)

Meet Silver ;)

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19 December 2012 02:52 PM #6

ShaneP Member

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Joined 2012-10-12

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-Profile.xls (found in the SDK archive) is the place to go for details about the types and messages derived from the base types described in the protocol doc.

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Fit Timestamp Conversion

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