[WIP] refactor: remove iso8601 #2193

Job	Run time
test (3.12)	6m 12s
test (3.14)	6m 11s
test (3.10)	5m 55s
test (3.11)	6m 13s
test (3.9)	6m 13s
test (3.13)	6m 12s
Check Windows Support for accel extra dependency	0s
Finish Coveralls	0s
	36m 56s

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