How do I get the timestamp from the MongoDB id?
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Answer
The timestamp is contained in the first 4 bytes of a mongoDB id (see: http://www.mongodb.org/display/DOCS/Object+IDs).
So your timestamp is:
JavaScript
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timestamp = _id.toString().substring(0,8)2
and
JavaScript
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date = new Date( parseInt( timestamp, 16 ) * 1000 )2