National Day is October 1st; the next day is October 2nd.
Tips
usage
Formal/written register — used in dates on letters, legal documents, news headlines, and historical writing (e.g. 二〇二六年四月二日). In speech and casual writing the day-of-month is usually said with 号: 四月二号 (April 2nd).
mistakes
二日 ≠ 'two days' in modern speech. For a duration of two days, say 两天 (liǎng tiān). Reserve 二日 for written-style date references and certain set phrases.
