prefer ISO standard date format (fix #27) #54

	name: Private Repository
	on:
	push:
	branches: [master]
	env:
	CGO_ENABLED: 0

	jobs:
	private-repo-test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v5
	with:
	go-version: '>=1.22.0'
	- run: go build
	- name: Get the expected output
	run: \|
	curl -H "Authorization: token ${GITHUB_TOKEN}" 'https://raw.githubusercontent.com/rhysd/private-repo-test/refs/heads/main/CHANGELOG.md' > EXPECTED.md
	cat EXPECTED.md
	env:
	GITHUB_TOKEN: ${{ secrets.PAT }}
	- name: Generate
	run: \|
	./changelog-from-release -r 'https://github.com/rhysd/private-repo-test' > OUTPUT.md
	cat OUTPUT.md
	env:
	GITHUB_TOKEN: ${{ secrets.PAT }}
	- name: Check
	run: \|
	diff=$(diff EXPECTED.md OUTPUT.md)
	if [[ "$diff" != "" ]]; then
	echo "$diff" >&2
	exit 1
	fi

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