How does MySQL calculate time difference?

How does MySQL calculate time difference?

MySQL: DATEDIFF Function

1. Description. The MySQL DATEDIFF function returns the difference in days between two date values.
2. Syntax. The syntax for the DATEDIFF function in MySQL is: DATEDIFF( date1, date2 )
3. Note. Only the date portion of date1 and date2 is used in the DATEDIFF calculation.
4. Applies To.
5. Example.

How do I get time difference in SQL?

To find the difference between dates, use the DATEDIFF(datepart, startdate, enddate) function. The datepart argument defines the part of the date/datetime in which you’d like to express the difference. Its value can be year , quarter , month , day , minute , etc.

What does timestamp function do in MySQL?

MySQL TIMESTAMP() Function The TIMESTAMP() function returns a datetime value based on a date or datetime value. Note: If there are specified two arguments with this function, it first adds the second argument to the first, and then returns a datetime value.

How do I calculate total hours in MySQL?

If you need seconds/minutes too (as suggested in comment), use either:

1. time_to_sec( )/3600 which will return value like 4.84 hours.
2. TIME_FORMAT( …, “%H:%m:%s”) which will display 4:38:24.

What is TIMESTAMP example?

The timestamp is parsed either using the default timestamp parsing settings, or a custom format that you specify, including the time zone….Automated Timestamp Parsing.

Timestamp Format	Example
MM/dd/yyyy HH:mm:ss ZZZZ	10/03/2017 07:29:46 -0700
HH:mm:ss	11:42:35
HH:mm:ss.SSS	11:42:35.173
HH:mm:ss,SSS	11:42:35,173

How does the timediff function in MySQL work?

The TIMEDIFF function accepts two arguments that must be the same type, either TIME or DATETIME. The TIMEDIFF function returns the result of dt1 – dt2 expressed as a time value. Because the TIMEDIFF function returns a TIME value, its result is limited to the range allowed for TIME values which is from -838:59:59 to 838:59:59.

How to calculate difference between two datetimes in MySQL?

USE TIMESTAMPDIFF MySQL function. For example, you can use: In your case, the third parameter of TIMSTAMPDIFF function would be the current login time ( NOW () ). Second parameter would be the last login time, which is already in the database. If your start and end datetimes are on different days use TIMEDIFF.

How to calculate the difference between two datetime values?

The following example calculates the difference between two DATETIME values: The TIMEDIFF function returns NULL if either argument is NULL. If you pass two arguments with different types, one is DATETIME and the other is TIME, the TIMEDIFF function also returns NULL.

What should be the value of the hour value in MySQL?

The query is – Wait a minute! We know basic maths that the difference of the hour values (955 – 555) should be a value greater than 283. Why did this happen?