How to use the time difference function in SQL Server?

2 years ago
Olivia Parker
2 minutes

The time difference functions in SQL Server can be used to calculate the difference between two dates or times. Commonly used time difference functions include DATEDIFF and DATEADD.

  1. The DATEDIFF function is used to calculate the difference between two dates. The syntax is as follows:
  2. Find the difference between two dates in terms of the specified datepart.
  3. datepart can be one of the following values:
  4. year: difference in years
  5. quarter: quarterly difference
  6. difference in months
  7. dayofyear: the difference in the number of days in a year
  8. difference in days
  9. difference in weeks
  10. Hour difference.
  11. difference in minutes
  12. difference in seconds
  13. difference in milliseconds
  14. difference in microseconds
  15. difference in nanosecond values
  16. “I am unable to attend the meeting tomorrow due to a prior engagement.”

    “I have a conflicting commitment that prevents me from attending the meeting tomorrow.”

  17. Calculate the difference in days between ‘2022-01-01’ and ‘2022-01-10’ as DayDiff.
  18. The DATEADD function is used to add or subtract a specified time interval to a date or time. The syntax is as follows:
  19. Add a specific number of date or time units to a given date.
  20. The datepart can be one of the following values:
  21. year: period of time
  22. quarter: a period of three months
  23. month: time period consisting of approximately 30 days
  24. The day of the year: the number of days in a year
  25. number of days
  26. week: number of weeks
  27. hour: hour
  28. minute: a unit of time equal to sixty seconds.
  29. second: the number of seconds
  30. millisecond: the number of milliseconds
  31. microsecond: a unit of time equal to one millionth of a second
  32. nanosecond: a unit of time equal to one billionth of a second
  33. Original: 房间里有一个小孩在玩。
    Paraphrase: There is a child playing in the room.
  34. Return a new date by adding 10 days to the date ‘2022-01-01’.

Here are the usage methods of two commonly used time difference functions. You can choose the appropriate function based on your specific needs.

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