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Understanding timestamps in Cognito Recall

The Cognito Recall product uses UNIX timestamps internally, represented as the number of seconds since midnight on the first of January 1970.  This allows a high degree of precision in timestamping while using standard UNIX library software for timestamp related operations.

Users may find that some timestamp fields in Cognito Recall show the timestamp "January 1st, 1970 00:00:00".  In systems with timezones set other than UTC this time may appear as December 31st, 1969 or at other times of the day.

This behavior is normal and reflects the field data actually containing a null value, usually meaning that the timestamp references an event which has not occurred, e.g. the time of a response packet as related to the time of the request packet.  The null value is interpreted by the timestamp rendering as zero, giving zero offset from January 1st, 1970.

Users should not be concerned with these timestamps and should consider them 'placeholders' for the field being empty or invalid.

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