Comment by wpm

Adafruit sells a DS3231 module with standard 2.54mm pin headers. I'm using one on a Beaglebone Black that I setup as my NTP/PTP server (using work based on your work from 2021, so thank you!). No soldering required.

https://www.analog.com/en/products/ds3231.html

https://www.adafruit.com/product/3013