Use Formatter::pad (instead of write_str) for Weekdays #3492

Job	Run time
features_check (ubuntu-latest)	3m 53s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	13s
no_std (ubuntu-latest, thumbv6m-none-eabi)	14s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	11s
rust_msrv (ubuntu-latest)	57s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	13s
alternative_targets (ubuntu-latest, aarch64-linux-android)	11s
rust_versions (ubuntu-latest, stable)	56s
rust_versions (ubuntu-latest, beta)	1m 19s
timezones (ubuntu-latest, ACST-9:30)	1m 15s
rust_versions (ubuntu-latest, nightly)	1m 13s
check-docs	20s
timezones (ubuntu-latest, EST4)	1m 25s
timezones (ubuntu-latest, UTC0)	1m 14s
cross-targets (x86_64-unknown-illumos)	1m 2s
timezones (ubuntu-latest, Asia/Katmandu)	1m 15s
cross-tests (ubuntu-latest)	1m 34s
timezones (macos-latest, ACST-9:30)	41s
timezones (macos-latest, EST4)	32s
test_wasi (ubuntu-latest, wasm32-wasi)	22s
timezones (macos-latest, UTC0)	43s
test_wasm (ubuntu-latest)	15s
timezones (macos-latest, Asia/Katmandu)	33s
timezones (windows-latest, ACST-9:30)	2m 44s
timezones (windows-latest, EST4)	2m 2s
timezones (windows-latest, UTC0)	2m 14s
timezones (windows-latest, Asia/Katmandu)	1m 25s
	28m 56s

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