(PECL mongo >= 1.0.1)
MongoId::getTimestamp — Gets the number of seconds since the epoch that this id was created
This returns the same thing as running time() when the id is created.
This function has no parameters.
Returns the number of seconds since the epoch that this id was created. There are only four bytes of timestamp stored, so MongoDate is a better choice for storing exact or wide-ranging times.