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An instant can be defined at different level (known also as precision)
Precision | Instant Name |
---|---|
year | |
year-month | |
year-month-day (such as an anniversary date) | date |
year-month-day hour | |
year-month-day hour:minute | |
year-month-day hour:minute:second | datetime |
year-month-day hour:minute:second.milliseconds | timestamp |
On a computer level, a date data type may be used to store time at the second level. (Example with java) You need to lookup the data type definition to known it's precision