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Is it based on wall clock time

If you don't set use_sim_time, then: yes.

Why does it always start with "14xxxxxx.xxx".

Because it is a unix timestamp which is just an integer representing "the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970" (wikipedia/unix_timestamp).

Everything after 1400000000 is any point in time after 2014-05-13T16:53:20+00:00.

Is it based on wall clock time

If you don't set use_sim_time, then: yes.

Why does it always start with "14xxxxxx.xxx".

Because it is a unix timestamp which is just an integer representing "the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970" (wikipedia/unix_timestamp).

Everything after 1400000000 is any point in time after 2014-05-13T16:53:20+00:00. (converted here).

Is it based on wall clock time

If you don't set use_sim_time, then: yes.

Why does it always start with "14xxxxxx.xxx".

Because it is a unix timestamp which is just an integer representing "the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970" (wikipedia/unix_timestamp).

Everything after 1400000000 is any point in time after 2014-05-13T16:53:20+00:00 (converted here).

Finally, see wiki/Clock for some more info.