Fix typos in Datelike impl for DateTime #2806

Job	Run time
check-docs	21s
cross-tests (ubuntu-latest)	2m 19s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	16s
cross-targets (x86_64-sun-solaris)	1m 16s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	18s
alternative_targets (ubuntu-latest, aarch64-linux-android)	12s
features_check (ubuntu-latest)	5m 35s
no_std (ubuntu-latest, thumbv6m-none-eabi)	12s
rust_msrv (ubuntu-latest)	2m 58s
features_check (macos-latest)	12m 56s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	12s
features_check (windows-latest)	9m 56s
rust_versions (ubuntu-latest, stable)	1m 15s
rust_versions (ubuntu-latest, beta)	1m 20s
test_wasi (ubuntu-latest, wasm32-wasi)	27s
test_wasm (ubuntu-latest)	36s
rust_versions (ubuntu-latest, nightly)	1m 23s
timezones (ubuntu-latest, ACST-9:30)	1m 28s
timezones (ubuntu-latest, EST4)	1m 24s
timezones (ubuntu-latest, UTC0)	1m 26s
timezones (ubuntu-latest, Asia/Katmandu)	1m 24s
timezones (macos-latest, ACST-9:30)	1m 35s
timezones (macos-latest, EST4)	1m 33s
timezones (macos-latest, UTC0)	1m 20s
timezones (macos-latest, Asia/Katmandu)	3m 6s
timezones (windows-latest, ACST-9:30)	4m 0s
timezones (windows-latest, EST4)	2m 39s
timezones (windows-latest, UTC0)	3m 8s
timezones (windows-latest, Asia/Katmandu)	2m 46s
	1h 7m 21s

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