The subject of the query, the proper noun "Veterans Day," refers to a specific and singular calendar day. As a designated federal holiday, it officially concludes at the end of its designated date, November 11th, specifically at 11:59 PM or the moment the clock transitions to the next day.
The temporal definition of the holiday is rooted in historical context but should not be confused with its duration. The armistice that ended World War I began at the 11th hour of the 11th day of the 11th month in 1918. While this specific moment is central to the day's origin and is often marked by ceremonies, the holiday itself encompasses the entire 24-hour period of November 11th. If this date falls on a Saturday or Sunday, the federal observance for government and some business purposes may be shifted to the preceding Friday or subsequent Monday, respectively. In such cases, the public observance ends at the close of the business day, but the historical day of remembrance still formally concludes at midnight on November 11th.
In practice, while the legal and official duration of the holiday spans the full calendar day, most public ceremonies, parades, and related activities occur during daylight or business hours. Therefore, for practical purposes, the public observance of the holiday typically ends in the late afternoon or evening. However, the formal designation of Veterans Day as a national day of observance persists until the very end of November 11th.