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The World, Understood

For Integrators and builders who ship one product to many countries — invoices, schedules, forms, reports — and direct AI to build the "global" parts. · 17 days · Tech

A 17-day course
One short lesson a day · go at your own pace
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Download as a skill — teach your own AI these checks
The days
  1. 0Draw the map you actually needBy the end you can render one instant and one number for three places from your terminal, and name the kinds of country habit that break "global" software.
  2. 1India: one clock, many everything elseBy the end you can render an Indian amount, date and financial year correctly from your terminal, and list the five things an AI-drafted invoice for India most often gets wrong.
  3. 2Time: the attribute that breaks firstBy the end you can store one launch instant, render it correctly for any place from its zone name, and name the six ways a "9am on 1 April" send-time goes wrong before it ships.
  4. 3South Asia around IndiaBy the end you can render the time and the fiscal year for each of India's six neighbours, say which of their weekends the library gets wrong, and handle a contested border in a product without taking a side.
  5. 4Southeast Asia: one country, three clocksBy the end you can render a launch time for each of Indonesia's three zones, read a Thai date in the Buddhist Era without mis-filing it by 543 years, and ship an invoice to Singapore, Vietnam and Malaysia with the right tax label and the right number of decimals.
  6. 5East Asia: one clock, five zones wideBy the end you can explain why China spans about five geographic time zones on one official clock, read `令和8年` as 2026, and say what your country dropdown claims about Taiwan, Hong Kong and Macau before a customer tells you.
  7. 6Money: the same amount, eight waysBy the end you can format one amount correctly for eight countries from your terminal, and name the four places an AI-drafted invoice's money goes wrong: minor units, rounding, separators, tax id.
  8. 7The Gulf and the moving monthBy the end you can say what weekday a launch lands on in Riyadh and Dubai, check a date against Ramadan from your terminal, and name what breaks when an amount is dropped into a right-to-left line.
  9. 8Europe: four sets, not oneBy the end you can place the UK, Switzerland, Norway and Ireland in the four European sets — EU, euro area, Schengen, EEA — and say which set decides an invoice's currency, its VAT line, and where its data may travel.
  10. 9Europe east, and Russia's eleven clocksBy the end you can say which central and eastern European countries bill in euro, decide deliberately how your country list treats Kosovo and Crimea, and render a Russian time across eleven zones without a daylight-saving rule.
  11. 10Africa: fifty-four countries, not one dropdownBy the end you can render an Ethiopian date and clock time from your terminal, name the three commercial groupings below the Sahara and the two things a checkout for Kenya must not assume, and list a disputed territory without taking a side.
  12. 11North America: one sign, three dollarsBy the end you can compute the exact dates US clocks change in any year, name the two states that never change them, and read a bare `$` price as the ambiguity it is.
  13. 12Latin America: Portuguese, two surnames, one commaBy the end you can format a Brazilian amount and check a CPF from your terminal, explain why "last name" is a question in Bogotá, and say which of Brazil, Mexico and Bolivia trade under Mercosur.
  14. 13Oceania: the day that exists twiceBy the end you can print one instant as three calendar dates from your terminal, name the Australian states that change clocks and the three that do not, and place New Zealand, Samoa and Kiribati against the date line.
  15. 14Names, addresses and languagesBy the end you can push a name, a postcode, a phone number and a locale tag through your terminal and say which countries a "sensible" validator quietly rejects, and why.
  16. 15Disputed places, sanctions and where data may liveBy the end you can name which list a country dropdown, a tax rule and a payment route each come from, say which official list and which data regime a "can we sell there?" answer must cite, and recognise the moment to stop and ask a human.
  17. 16Audit the world the AI builtBy the end you can take an AI-drafted invoice and launch email meant for "all customers", run both through the checks of the last sixteen days, and produce a scorecard that names, for seven countries, what breaks and which rule catches it.