The Timestamp value as displayed in the shell has the format Timestamp(<time_t>, <ordinal>), where time_t is a32-bit value indicating seconds since the unix epoch and the 32-bit ordinal value is for ordering operations occurring in the same second. To convert to a Date object representing the datetime at which the operation happened, in the shell,
> x
Timestamp(1413302103, 1)
> x.t
1413302103
> new Date(x.t * 1000)
ISODate("2014-10-14T15:55:03Z")
The * 1000 is necessary because Date() expects milliseconds. For more:
Timestamp BSON type. Keep in mind Timestamp is meant just for internal MongoDB use and in your own data you should prefer the Date type.
-Will