How is the Instant data type stored?

How is the Instant data type stored?

• A. A time without a date; stored as the number of seconds since midnight; converted back to normal time for display
• B. Stored as milliseconds since 1970
• C. Stored as separate date and time fields
• D. Date/Time stored in a single item as the number of seconds since midnight on 12/31/1840 and converted back to normal for display

Answer: (D)

Instant represents a precise moment in time as a single numeric value, not as separate date and time components. In this system, that value is the total seconds elapsed since a fixed epoch—midnight on 12/31/1840. Storing the instant this way keeps the moment unambiguous and easy to compare or compute with, and the human-readable date and time are produced by converting that numeric value to a standard date-time format when displaying to the user. That’s why the correct description matches: a single numeric count of seconds from the epoch, with a conversion step back to normal date and time for display. The other ideas describe either a time-of-day without a date, a different epoch and unit, or separate date and time fields, none of which capture a single instant in time in the same way.

Instant represents a precise moment in time as a single numeric value, not as separate date and time components. In this system, that value is the total seconds elapsed since a fixed epoch—midnight on 12/31/1840. Storing the instant this way keeps the moment unambiguous and easy to compare or compute with, and the human-readable date and time are produced by converting that numeric value to a standard date-time format when displaying to the user.

That’s why the correct description matches: a single numeric count of seconds from the epoch, with a conversion step back to normal date and time for display. The other ideas describe either a time-of-day without a date, a different epoch and unit, or separate date and time fields, none of which capture a single instant in time in the same way.