id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
32366	Update usage of now() & co	Carlton Gibson	Nick Pope	"

Using datetime.now(), rather than utcnow() is the modern recommended approach.

Warning in docs: 
> ... the recommended way to create an object representing the current time in UTC is by calling datetime.now(timezone.utc).

https://docs.python.org/3.9/library/datetime.html#datetime.datetime.now
https://docs.python.org/3/library/datetime.html#datetime.datetime.utcnow

More depth here:
https://blog.ganssle.io/articles/2019/11/utcnow.html

`datetime.utcfromtimestamp()` and `datetime.utctimetuple()` carry similar warnings. 

* Update the code to modern usage. 
* Update docs examples (for backport to stable docs). "	Cleanup/optimization	closed	Utilities	4.0	Normal	fixed			Ready for checkin	1	0	0	0	0	0