Working with datetime type in Quickbooks My Time files

Posted by jakemcgraw on Stack Overflow See other posts from Stack Overflow or by jakemcgraw
Published on 2011-01-06T04:42:58Z Indexed on 2011/01/06 5:54 UTC
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I'm attempting to process Quickbooks My Time imt files using PHP. The imt file is a plaintext XML file. I've been able to use the PHP SimpleXML library with no issues but one:

The numeric representations of datetime in the My Time XML files is something I've never seen before:

<object type="TIMEPERIOD" id="z128">
    <attribute name="notes" type="string"></attribute>
    <attribute name="start" type="date">308073428.00000000000000000000</attribute>
    <attribute name="running" type="bool">0</attribute>
    <attribute name="duration" type="double">3600</attribute>
    <attribute name="datesubmitted" type="date">310526237.59616601467132568359</attribute>
    <relationship name="activity" type="1/1" destination="ACTIVITY" idrefs="z130"></relationship>
</object>

You can see that attritube[@name='start'] has a value of:

308073428.00000000000000000000

This is not Excel based method of storage 308,073,428 is too many days since 1900-01-00 and it isn't Unix Epoch either.

So, my question is, has anyone ever seen this type of datetime representation?

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