My own blog post here commemorating the event: https://susam.net/maze/unix-timestamp-1600000000.html
Given that 100 000 000 seconds is approximately 3 years 2 months, we are going to see an event like this every few years.
I believe the most spectacular event is going to be the Unix timestamp 2 000 000 000 which is still 9½ years away: 2033-05-18 03:33:20 UTC. Such an event occurs only once every 33 years 8 months approximately!
By the way, here's 1700000000 on Python:
$ python3 -q
>>> from datetime import datetime
>>> datetime.utcfromtimestamp(1_700_000_000)
datetime.datetime(2023, 11, 14, 22, 13, 20)
>>>
GNU date (Linux): $ date -ud @1700000000
Tue Nov 14 22:13:20 UTC 2023
BSD date (macOS, FreeBSD, OpenBSD, etc.): $ date -ur 1700000000
Tue 14 Nov 2023 22:13:20 UTC