Are the numbers inside the blocks are in some sort of date format?

[  1613.015] (II) config/udev: Adding input device HDA Digital PCBeep (/dev/input/event16)
[  1613.015] (II) No input driver specified, ignoring this device.
[  1613.015] (II) This device may have been added with another device file.
[  1613.016] (II) config/udev: Adding input device HDA Intel PCH Mic (/dev/input/event17)

It's a timestamp. It indicates the time since the system last booted, in seconds.

If you are running Linux then you can find the same number as the first field of the contents of /proc/uptime.

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