My Account. So working with dates is something every MySQL database developer must do once in a while. And most of the time, this will require calculating the number of days between date values. This function allows you to determine the difference between two dates quickly. Therefore, all you have to do is to pass required input parameters to the function; and it will return a value indicating the difference between the two inputs.Dates And Times in PHP: Differences (10/13)
Note: expression1 is the first date, and expression2 is the second date. Equally important, you may be wondering what does the MySQL datediff function return. As you can see from the above example, the function will return the number of days between the two dates you provided.
Also, if you provided datetimes instead of date days, then the function will equally return the difference between the two provided date times in days. First, how do you get the difference between two times in seconds? The datediff function is probably not the best function to use in such a situation. Therefore, if you supply the seconds in the date, only the date portion is used in the calculation to return the number of days.
And the two expressions must be of the same type. For example:. The above query statement will return the different between the two datetime values provided in seconds and as shown below:.
Likewise, there will be times you need to get the difference in two datetime expression in minutes. Instead, use the TimeStampDiff function to accomplish this task. The above query statement will return the difference between the two datetime values provided in minutes and as shown below:.
Furthermore, as you can see from the above two examples when looking for the difference in two datetime expressions, the MySQL DateDiff hours is not a reliable solution.
The above query statement will return the difference between the two datetime values provided in hours and as shown below:. So this is how the function works. Of course, there will be occasions where you need to know the difference between two periods.
MySQL DateDiff – Quick Guide Seconds, Minutes, Hours, Months, Years
Besides, you can use the function together with the Current Date function. As with anything, feel free to solidify your understanding of the fundamental concepts by reading other available resources as well as MySQL documentation. Good luck! Reseller Hosting. Ruby on Rails Hosting.
This means, it's not considering the 50 minutes left. Therefore, the result should be 2. This allows you to see the hours, minutes, seconds, etc. Learn more. How to get the difference between two dates rounded to hours Ask Question. Asked 10 years, 1 month ago. Active 7 months ago. Viewed 84k times.
Brian Roisentul Brian Roisentul 4, 7 7 gold badges 50 50 silver badges 79 79 bronze badges. Are you casting to an integer?
You should get a time result back, like ''. Active Oldest Votes. Matthew Matthew I just had a bug because of this. This solution is not reliable. Denis Malinovsky 4, 1 1 gold badge 19 19 silver badges 16 16 bronze badges. Saurabh Shakyawar Saurabh Shakyawar 1 1 silver badge 4 4 bronze badges. You reposted in the wrong neighborhood, but your intentions are appreciated anyway.
Tome su voto a favor. Works perfectly, except that in the version I'm using at least 5. BSingh BSingh 1 1 gold badge 6 6 silver badges 8 8 bronze badges. Eric Leschinski k 49 49 gold badges silver badges bronze badges.
Why not timestampdiff hour,' ', ' '? It doesn't take into account the minutes. The one you suggested returns answer as 2, whereas the above solution gives 2. Pang 8, 17 17 gold badges 73 73 silver badges bronze badges.
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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm Trying to get the timediff from my table and convert it to hours it's for an hourly billed service. Edit: Alternatively, TimestampDiff may also provide a valid solution in more elegant way providing its example:. Using HOUR will only return hours as an integer.
Below would correct the most popular answer to return hours as an integer and minutes as a decimal ie 6. As we see in the example above, it surprisingly even works beyond the timestamp limitation in year You can substract both timestamp to get difference in second. Divide it with will give you difference in hour.
Learn more. Asked 10 years, 8 months ago. Active 1 year, 1 month ago. Viewed 74k times.
Calculate time difference in hours minutes and seconds in SQL Server
Possible duplicate. I think everyone missed a very importantpoint here - because it's non-techie. Things billed by the hours are nornally billed by the hour startednot completed. So, all of these answers probably need to round up. Active Oldest Votes. Erica Kane 2, 19 19 silver badges 29 29 bronze badges. Trav L Trav L OP's approach worked in that case. Spudley k 37 37 gold badges silver badges bronze badges.
Funk Doc Funk Doc 1, 1 1 gold badge 9 9 silver badges 12 12 bronze badges. In which case, as OP says "it's for an hourly billed service", I imagine that you would want to round any fraction upwards to the next whole hour. Joey Joey k 75 75 gold badges silver badges bronze badges. Taz 3, 2 2 gold badges 31 31 silver badges 52 52 bronze badges. Ralf Strehle Ralf Strehle 1 1 silver badge 2 2 bronze badges. Donny Kurnia Donny Kurnia 4, 5 5 gold badges 32 32 silver badges 47 47 bronze badges.
RogerDueck, Gusmar I'm not seeing how it accounts for daylight savings RogerDueck Nevermind. You both are right, but one's database's or db sesson's timezone needs to be set to a timezone that observes daylight savings.
I think the first one is the most efficent. You should choose one of the answers as accepted, instead of create answers like this. Also, use comment in the appropiate answers, instead of rewrite or re-quote.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. According to the documentationthe first argument can be any of the following:. If you're using Unix Timestamp integerthen it would be even easier:. Learn more. Calculating time difference between 2 dates in minutes Ask Question.
Asked 9 years ago. Active 11 months ago. Viewed k times. How can I do it? Akshay Akshay 1, 5 5 gold badges 22 22 silver badges 21 21 bronze badges. Are you really trying to select records whose timestamp is at least 20 minutes in the future? Because that's what the condition in your query says. Active Oldest Votes. Imran Ahmad 5, 2 2 gold badges 30 30 silver badges 40 40 bronze badges. Nicola Peluchetti Nicola Peluchetti Mouloud Mouloud 3, 1 1 gold badge 21 21 silver badges 19 19 bronze badges.
I am using below code for today and database date. Matilda Smeds 8 8 silver badges 16 16 bronze badges. Deepak Dholiyan Deepak Dholiyan 1, 1 1 gold badge 13 13 silver badges 31 31 bronze badges.
Ilmari Karonen I don't know is MySQL's optimizer is smart enough to do this by itself, but on general principle I'd rewrite the first condition as T. It might not be, if MySQL is smart enough, but in general, if you have an index on t. I can't edit my comment any more to fix it, but I can and just did edit the answer. Sign up or log in Sign up using Google.
Sign up using Facebook.How to calculate time difference in hours minutes or seconds in SQL Server? For example, only seconds, or only minutes or only hours.
So, calculating the difference between a start date and end date is not straightforward with SQL Server. This post shows you how to do so with a simple example query, explained step by step. And every query gives only one unit. So basically, we must combine or concatenate several queries to get the hours, minutes and seconds within one unique SQL query.
Below each query is returning one unit. To get the difference in hours, minutes and seconds, use this query, it works only if hours are smaller than In this short post we have seen how to calculate a SQL Server date difference in hours minutes and seconds. Writing about dates, here is how to display the month from a SQL Server date.
How to alter an existing stored procedure in a SQL Server database?
Convert DateDiff into Hours, Minutes, Seconds, Milliseconds
Simply use the alter command instead of the create command one to modify an existing SQL procedure. With SQL Server data, it is useful …. October 11, Cannot insert duplicate key. SQL Server. May 31, SQL Server. SQL Server Errors.
I would like to be able to find out the total time elapsed, so if I have an event that occurred at and the next event occurred at I want to be able to get the difference, which would be equal to Then, I would like to express this as a decimal, in this case 6. I needed similar. In your case, as I understand it, the times are backwards, ie. Divide it by This solution assumes, your columns are date-compatible values.
Learn more. Asked 9 years, 7 months ago. Active 2 years, 11 months ago. Viewed 84k times. I set up my MySQL database with the field 'time' It is not HH:MM in the traditional sense, it is the time an event occurred, so an event with the value of occurred with 5 minutes 45 seconds left in a game.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am storing the last login time in MySQL in, datetime -type filed. When users logs in, I want to get the difference between the last login time and the current time which I get using NOW.
For example, you can use:. Second parameter would be the last login time, which is already in the database. Learn more. Asked 8 years, 4 months ago. Active 1 year, 7 months ago. Viewed k times. How can I calculate it?
Devesh Agrawal Devesh Agrawal 7, 16 16 gold badges 60 60 silver badges bronze badges. Active Oldest Votes. That is to update the last login right??
I want similar kind of functionality. Its returning NULL. Any idea why?? YEs that is working, But i need to fetch the second parameter from table. How to achieve that. Infact i want to avoid nested query. Any Idea? Adi Adi 21 3 3 bronze badges. Sign up or log in Sign up using Google.
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