About

What this is

Mythatday does two things: it lays your whole life out as a poster with one square per week, and it takes you back to the day you were born — the weather, the moon, the events, the people born the same day, the songs of that time.

It is a small free site made by one person, with no ads and no sign-up.

How the numbers are computed

Weeks: a year counts as 52 weeks; the whole weeks from your birth date to today are "lived". The default lifespan is 80 years and you can change it.

Elapsed time: counted from midnight local time on your birth date; there is no time of birth.

Sun sign: tropical zodiac; on a cusp day the page notes that the neighbouring sign is possible.

Moon phase: estimated with an astronomical formula for noon on your birth date, accurate to within half a day.

Lunar date and zodiac animal: converted with the browser's built-in Chinese calendar (Intl); hidden on the few browsers that lack it.

Weather: ERA5 reanalysis data from Open-Meteo (about a 9 km grid), a model reconstruction rather than a weather-station reading; nothing before 1940.

Data sources and licences

The data is selected and edited (not reproduced in full). Sources and licences:

Wikipedia and the Wikimedia "On this day" feed ↗

CC BY-SA 4.0Events of the day, news around that day (month and year pages), people born the same day, the Golden Horse and Academy Award best films of the year, and the content and photos of each day page.

Wikidata ↗

CC0YouTube video IDs for songs.

Open-Meteo (ERA5, Copernicus Climate Change Service) ↗

CC BY 4.0Weather on your birth date and city coordinates.

Billboard Hot 100 number ones ↗

Compiled from English Wikipedia lists (CC BY-SA 4.0)Weekly US number ones since 1958.

Golden Melody Awards: Song of the Year, best Mandarin singers, best composer and lyricist ↗

Compiled from Chinese Wikipedia lists (CC BY-SA 4.0)Winners and nominees since 1990.

Taiwan's 200 best pop albums ↗

Compiled from Chinese Wikipedia (CC BY-SA 4.0)Representative albums per year, 1975–2005; classics for 1945–1974 are curated by the site with a Wikipedia link each.

UN World Population Prospects 2024 (via Our World in Data) ↗

CC BY 4.0Babies born in Taiwan and worldwide in your birth year, and world population.

Google Fonts ↗

Fonts served by GoogleInter Tight and Noto Sans TC, loaded from Google on every page.

YouTube ↗

Videos are served by YouTube and load only when you press playEmbedded via youtube-nocookie.com; video IDs come from Wikidata and YouTube search.

Privacy

No sign-up, your birthday is not stored, and there are no ads. What you enter lives only in the URL: share it if you want, otherwise it leaves no trace.

Every page loads its fonts from Google Fonts. A "that day" page asks Wikipedia and Open-Meteo directly, and YouTube only when you press play; the day pages (such as /en/day/05-20/) load portraits straight from Wikimedia. Those services see your IP address, just as if you visited them yourself.

Page views are counted with Vercel Web Analytics: no cookies, no personal data, just how often each page is viewed.

Feedback

Typos, wrong data, ideas: tell me. Contact ↗