MongoDB::Timestamp - Replication timestamp
This is an internal type used for replication. It is not for storing dates, times, or timestamps in the traditional sense. Unless you are looking to mess with MongoDB's replication internals, the class you are probably looking for is DateTime. See MongoDB::DataTypes for more information.
Seconds since epoch.
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COPYRIGHT AND LICENSE
This software is Copyright (c) 2015 by MongoDB, Inc..
This is free software, licensed under:
The Apache License, Version 2.0, January 2004