Anniversary Math Made Simple: Get the Nth Exactly Right
on 26th Dec, 2025
A practical guide to calculating, checking, and communicating anniversaries for people, historic events, and observances. Learn the difference between inclusive and exclusive counting, how to handle leap days and year boundaries, and how to verify dates quickly using CalendarZ countdowns and tools.
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Tax Day Worldwide: Filing Deadlines by Country and When They Move
on 24th Dec, 2025
Explore when personal income tax returns are due around the world, why each country picks its filing date, and how weekends and public holidays push deadlines to observed dates. Learn notable quirks like the U.S. Emancipation Day shift and how to add Tax Days to your calendar with countdowns and smart reminders.
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Digits by Date: How Numeral Systems Shape Holiday Calendars Worldwide
on 23rd Dec, 2025
Explore how dates appear across numeral systems—Western Arabic, Eastern Arabic‑Indic, Devanagari, Chinese, Thai, and more—and what that means for reading holiday listings and “On This Day” entries. Learn practical tips to recognize numerals at a glance and convert dates between scripts and calendars without mixing up the day.
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