Join date is incorrect

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Discussed in #737

^{Originally posted by JBYT27 January 2, 2022}

Hello!

So I checked out my metrics.svg, but for some reason it says I joined 1 day ago, which isn't true. When you check the contributions on my profile page, it says otherwise, and I have been on GitHub for at least almost a year. Is it possible to fix this? Thanks!

Screenshots

Metrics

GitHub contributions

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Should be an issue within this code section:

metrics/source/plugins/core/index.mjs

Lines 96 to 108 in 7a31b26

	//Compute registration date
	const now = Date.now()
	const beginningOfYear = new Date(now).setUTCMonth(0, 1)
	const created = new Date(data.user.createdAt)
	const diff = now - created
	const years = new Date(diff).getUTCFullYear() - new Date(0).getUTCFullYear()
	const nowMonth = new Date(now).getUTCMonth()
	const createdMonth = created.getUTCMonth()
	const months = nowMonth - createdMonth + 12 * (years + (nowMonth < createdMonth ? 1 : 0))
	const days = Math.floor((now - beginningOfYear) / (1000 * 60 * 60 * 24))
	computed.registered = {years: years + days / 365.25, months}
	computed.registration = years ? `${years} year${imports.s(years)} ago` : months ? `${months} month${imports.s(months)} ago` : `${days} day${imports.s(days)} ago`
	computed.cakeday = years > 1 ? [new Date(), new Date(data.user.createdAt)].map(date => date.toISOString().match(/(?<mmdd>\d{2}-\d{2})(?=T)/)?.groups?.mmdd).every((v, _, a) => v === a[0]) : false

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