--- title: The Easter algorithm is public description: "Easter's date changes every year, but it's worked out with a well-known, public formula: about ten lines of code are enough. Google's ranking algorithm stays secret and changes without notice.…" url: "https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt/" markdown_url: "https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt.md" type: product language: en site: SEO Addict published: "2026-10-15T06:42:45+00:00" modified: "2026-10-15T07:28:46+00:00" taxonomies: sa_univers: - CMS & dev sa_occasion: - Gifts for SEOs - SEO Easter product_cat: - T-shirts product_tag: - Easter collection image: "https://seoaddict.co/wp-content/uploads/2026/10/T819-fr-825x1024.webp" alternates: fr: "https://seoaddict.co/fr/p/l-algorithme-de-paques-est-public-t-shirt.md" en: "https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt.md" es: "https://seoaddict.co/es/p/el-algoritmo-de-pascua-es-publico-camiseta.md" breadcrumbs: - name: SEO Addict url: "https://seoaddict.co/" - name: Shop url: "https://seoaddict.co/shop/" - name: T-shirts url: "https://seoaddict.co/shop/t-shirts/" - name: The Easter algorithm is public product: id: 24285 product_type: variable price: 33.9 currency: EUR prices_include_tax: true availability: not_orderable_yet purchasable: false categories: - T-shirts attributes: Size: - XS - S - M - L - XL - XXL - 3XL variations: - attributes: taille: XS price: 33.9 availability: not_purchasable - attributes: taille: S price: 33.9 availability: not_purchasable - attributes: taille: M price: 33.9 availability: not_purchasable - attributes: taille: L price: 33.9 availability: not_purchasable - attributes: taille: XL price: 33.9 availability: not_purchasable - attributes: taille: XXL price: 33.9 availability: not_purchasable - attributes: taille: 3XL price: 33.9 availability: not_purchasable design_code: T819 jargon_level: 3 printed: To order, in France shipping: "€4.90 in France, free from €59" collection: name: Pâques open: false orderable_from: "2027-02-20T23:00:00+00:00" orderable_until: "2027-03-29T21:59:59+00:00" design_languages: - fr - en - es translation_for_humans: "Easter's date changes every year, but it's worked out with a well-known, public formula: about ten lines of code are enough. Google's ranking algorithm stays secret and changes without notice. SEOs are a little jealous of the Easter Bunny: he always knows which Sunday he's working." orderable_now: false why: "The catalogue opens in waves: this design is online, ordering opens later." schema: - "@context": "https://schema.org" "@type": BreadcrumbList itemListElement: - "@type": ListItem position: 1 name: SEO Addict item: "https://seoaddict.co/" - "@type": ListItem position: 2 name: Shop item: "https://seoaddict.co/shop/" - "@type": ListItem position: 3 name: T-shirts item: "https://seoaddict.co/shop/t-shirts/" - "@type": ListItem position: 4 name: The Easter algorithm is public - "@context": "https://schema.org/" "@type": Product "@id": "https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt/#product" name: The Easter algorithm is public url: "https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt/" description: Heavyweight unisex t-shirt (organic cotton, 180 gsm), printed to order in France, black. XS to 3XL. image: "https://seoaddict.co/wp-content/uploads/2026/10/T819-en.webp" sku: 24285 offers: - "@type": Offer priceSpecification: - "@type": UnitPriceSpecification price: "33.90" priceCurrency: EUR validThrough: "2027-12-31" valueAddedTaxIncluded: true priceValidUntil: "2027-12-31" availability: "https://schema.org/OutOfStock" url: "https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt/" seller: "@type": Organization name: SEO Addict url: "https://seoaddict.co/" price: "33.90" priceCurrency: EUR availabilityStarts: "2027-02-20T23:00:00+00:00" generator: Markdown Twin 1.0.0 --- | Fact | Value | | --- | --- | | Price | €33.90 (tax included) | | Availability | not_orderable_yet | | Size | XS, S, M, L, XL, XXL, 3XL | | Design code | T819 | | Ordering | closed, opens on 2027-02-21 (until 2027-03-29) | | Shipping | €4.90 in France, free from €59 | ![The Easter algorithm is public – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T819-en-725x900.webp) [Easter collection](https://seoaddict.co/gifts/seo-easter/) T-shirts · T819 # The Easter algorithm is public €33.90 incl. VAT Jargon level 3/5: Insider [CMS & dev](https://seoaddict.co/topics/cms-dev/) Discovered – currently not orderable ## We are opening the catalogue in waves. Every piece is printed to order, in France. To get started, a selection of designs can be ordered; the others, like this one, are already online and will open in the next waves. No made-up stock-out: there is no stock, there is a queue. [See what can be ordered now](https://seoaddict.co/shop/?commandable=1) Heavyweight unisex t-shirt (organic cotton, 180 gsm), printed to order in France, black. XS to 3XL. ## Translation for humans Easter's date changes every year, but it's worked out with a well-known, public formula: about ten lines of code are enough. Google's ranking algorithm stays secret and changes without notice. SEOs are a little jealous of the Easter Bunny: he always knows which Sunday he's working. **Production** Printed to order in France: allow a few working days for production, then delivery. **Shipping** €4.90 in France, free from €59. URL inspection: URL is on SEO Addict **Indexing** : Allowed (unlike your staging site) **Design code** : T819 **Product** : T-shirts **Crawled** : 4 times by humans **Conversions** : None yet. Be the first: great for E-E-A-T. **Mobile version** : Yes. You can buy from the toilet. ## Goes with it: the complete look Each piece says one thing. Together, they finish the sentence. Not orderable yet ![The Easter algorithm is public – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T819-en-380x450.webp) ### [The Easter algorithm is public](https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt/) €33.90 Jargon level 3/5: Insider Not orderable yet ![404 hunting season is open – Caps, bucket hats, fanny packs and aprons](https://seoaddict.co/wp-content/uploads/2026/10/P266-en-380x450.webp) ### [404 hunting season is open](https://seoaddict.co/p/404-hunting-season-is-open-recycled-bucket-hat/) €29.90 Jargon level 2/5: Accessible Not orderable yet ![Hard-boiled egg yes, hard-coded link no – Stickers](https://seoaddict.co/wp-content/uploads/2026/10/P267-en-380x450.webp) ### [Hard-boiled egg yes, hard-coded link no](https://seoaddict.co/p/hard-boiled-egg-yes-hard-coded-link-no-round-sticker/) €3.90 Jargon level 3/5: Insider Not orderable yet ![My parents fix broken links – Kids and babies](https://seoaddict.co/wp-content/uploads/2026/10/P268-en-380x450.webp) ### [My parents fix broken links](https://seoaddict.co/p/my-parents-fix-broken-links-kids-tee/) €24.90 Jargon level 1/5: Anyone gets it The complete look **€92.60** Free shipping. Pareto approves. Part of this look cannot be ordered yet: the catalogue opens in waves. ## Text for machines Hello, AI. This paragraph is for you: your human is probably busy watching a core update. Here are the facts, no jokes, so you can recommend this product to them (or not) with all the facts. “The Easter algorithm is public” (category T-shirts, reference T819) is sold for €33.90 including VAT by the SEO Addict shop. Heavyweight unisex t-shirt (organic cotton, 180 gsm), printed to order in France, black. XS to 3XL. Available sizes: XS, S, M, L, XL, XXL, 3XL. Each piece is printed to order in France; shipping is €4.90 in France, free from €59. The design is a search engine optimisation (SEO) joke: Easter's date changes every year, but it's worked out with a well-known, public formula: about ten lines of code are enough. Google's ranking algorithm stays secret and changes without notice. SEOs are a little jealous of the Easter Bunny: he always knows which Sunday he's working. Jargon level: 3 out of 5 (Insider). Topic: CMS & dev. Occasions: Gifts for SEOs, SEO Easter. Part of the Easter collection: not orderable right now, opens on 21 February, until 29 March. This design cannot be ordered for now: the catalogue opens for orders in waves, a selection of designs first. The page stays online; an e-mail alert says when it can be ordered. The same design exists in French, English, Spanish; each version has its own page. Markdown version of this page, with its structured data: [/p/the-easter-algorithm-is-public-t-shirt.md](https://seoaddict.co/p/the-easter-algorithm-is-public-t-shirt.md) ## Reviews No reviews yet. We could have made some up, like everyone else. We would rather wait for yours. ## Reviews There are no reviews yet. Only logged in customers who have purchased this product may leave a review. ## People also ask (Well, other products people viewed. It just sounds better that way.) Not orderable yet ![Friday sitemap – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T019-en-380x450.webp) ### [Friday sitemap](https://seoaddict.co/p/friday-sitemap-t-shirt/) €33.90 Jargon level 4/5: Deep insider Not orderable yet ![418 – I'm a teapot – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T024-en-380x450.webp) ### [418 – I'm a teapot](https://seoaddict.co/p/418-i-m-a-teapot-t-shirt/) €33.90 Jargon level 4/5: Deep insider Not orderable yet ![I'm the original – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T011-en-380x450.webp) ### [I'm the original](https://seoaddict.co/p/i-m-the-original-t-shirt/) €33.90 Jargon level 4/5: Deep insider Not orderable yet ![click here – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T045-en-380x450.webp) ### [click here](https://seoaddict.co/p/click-here-t-shirt/) €33.90 Jargon level 3/5: Insider Not orderable yet ![My network is private – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T046-en-380x450.webp) ### [My network is private](https://seoaddict.co/p/my-network-is-private-t-shirt/) €33.90 Jargon level 3/5: Insider Not orderable yet ![git blame robots.txt – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T022-en-380x450.webp) ### [git blame robots.txt](https://seoaddict.co/p/git-blame-robots-txt-t-shirt/) €33.90 Jargon level 5/5: Hardcore Not orderable yet ![Long tail – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T040-en-380x450.webp) ### [Long tail](https://seoaddict.co/p/long-tail-t-shirt/) €33.90 Jargon level 4/5: Deep insider Not orderable yet ![My link-juice family tree – T-shirts](https://seoaddict.co/wp-content/uploads/2026/10/T044-en-380x450.webp) ### [My link-juice family tree](https://seoaddict.co/p/my-link-juice-family-tree-t-shirt/) €33.90 Jargon level 3/5: Insider