Is the date "1901" a proper know?

I meant, is the date 1901 a proper noun?

In my opinion, a date such as 1901 is a common noun.

To determine if a specific date, such as "1901," is a known or recognized date, you can follow these steps:

1. Verify the historical context: Consider whether the date falls within a known historical period or era. In the case of "1901," it corresponds to the 20th century.

2. Check for significant events: Research notable events, inventions, or landmarks associated with the given year. For example, in 1901, the first Nobel Prizes were awarded, and Queen Victoria passed away, marking the end of the Victorian era.

3. Cross-reference with calendars: Confirm if the date aligns with commonly used calendars, such as the Gregorian calendar, which is used by most countries today. It's important to account for any calendar changes that may have occurred in the respective region during that time.

Based on these steps, "1901" is indeed a known date and falls within the 20th century. It is associated with significant historical events, making it a proper and recognized year.