Then we just use DATEADD to add that number of days to the Epoch Date and we get the correct dates. Ok… I said that works, but the EarliestDate came out as 02 Jan instead of 01 Jan All we had to do was drop the time. Look at the right 3 digits of that! In other words, to get the whole number of days for negative UNIX Timestamps, we need to drop the time with Integer Math Division just like we did before. The thing is, the underlying date serial number is If we drop the time, we end up with the "Whole" number days which, if you look at the drawing below, represents the date of 02 Jan Time increases from left to right by getting LESS negative or More positive just like the dates and times greater than the Epoch.
The Blue arrow shows how we go back in time from the Epoch date, producing negative Date Serial Numbers. We simply discarded the other whole number, which was the Remainder and that's the "time" part of the date as a whole number of milliseconds. And here are the results, which are the "Remaining" milliseconds that are not a part of the whole days.
To summarize, we have a formula to extract and convert "Whole" days to "Whole" dates and we have a formula to isolate the left-over milliseconds, which is the "time of day". Converting the code that we ended up with to a User Defined Scalar Function would be a travesty for a bazillion reasons that all end up with a combination of poor performance and excessive CPU usage, not to mention that any code that uses the function would go "single threaded".
You can learn how and why to use iTVFs at the following article. I try to name functions after what they do. I also know that, by definition, they will be of the BIGINT datatype. There will be rounding errors that are sometimes as horrendous as the bad way to do this as demonstrated earlier in the article. They're simple to make from the code near the beginning of the article. You have to have some of the "fun", especially if you got here from the "tl;dr" part.
We covered what UNIX Timestamps are, what some of the problems with the "Old" INTeger type are, why they needed to shift to a "New" BIGINT type, and how they took advantage of the massive scale of the BIGINT datatype to include milliseconds as a commonly used timestamp. We learned what an Epoch was and found out that the Epoch Date for both "Old" and "New" UNIX Timestamps is the first instant of 01 January We learned how to abbreviate dates for the first of the year as a 4 digit string representation of the year number.
Finally, we ended up with a function that has only two short lines of active code that make the conversion of the "New" type of UNIX Timestamps to DATETIME2 3 datatypes quick and easy. Those problems and the solution will be covered in Part 2. Log in or register to rate. Join the discussion and add your comment. Inline Table Valued Functions iTVFs are one type of user defined function that is available to implement in SQL Server since SQL Server iTVFs remain a very useful tool in our SQL armoury, so let's quickly revisit them and the different ways we can use them in our code.
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tl;dr A complete and documented function is available at the end of the article. You don't know what you're missing though. Many of the solutions are flat out wrong because of rounding errors that creep into the picture due to implicit datatype conversions even when the target datatype is ultimately DATETIME2 3. Others incorrectly use the LEFT function to isolate seconds, which produces incorrect answers the closer we come to or the further away we get from the Epoch Date because the scale of the value changes by 1 or more digits..
Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. So with the help of MikeT this is what I have come up with to convert the Apple Cocoa Core Data timestamp values into Unix epoch values:. Then, to get my localtime, I needed to add an additional parameter localtime to my datetime function in SQLite. I am revieving the sqlite database of my ScanSnap Home scanner and document manager for Mac.
The database has many tables with timestamp fields in it. For example: I have a date value that I can see in the user interface as That date value translates to in the database timestamp field. com But it will give me September 30, Check out Cocoa Core Data Timestamp Converter. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams?
Learn more about Collectives. Learn more about Teams. SQLite timestamp field - converting to datetime Ask Question. Asked 3 years, 6 months ago. Modified 3 years, 6 months ago. Viewed 3k times. sqlite The database has many tables with timestamp fields in it. com But it will give me September 30, What am I missing?
sqlite timestamp. edited Mar 1, at asked Feb 27, at Ugur Ugur 1, 2 2 gold badges 21 21 silver badges 44 44 bronze badges. Add a comment. Sorted by: Reset to default. Highest score default Trending recent votes count more Date modified newest first Date created oldest first. Your timestamp appears to be an Apple Cocoa Core Data timestamp. By adding it converts to an epoch value. answered Feb 27, at MikeT MikeT Thank you a million times.
I would never have found that out in a reasonable time. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Not the answer you're looking for? Browse other questions tagged sqlite timestamp or ask your own question.
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For example: I have a date value that I can see in the user interface as I had the same problem with timestamp eg:'JUL Asked 5 years, 11 months ago. We're golden for the use of DATEADD later on! It doesn't look like unix timestamp but datetime without some chars just digits are left. SomeTable st CROSS APPLY dbo.Timestamp to Date. Here's a coded example. Ask Question. jpg I have a dataset as shown in the image. Find centralized, trusted content and collaborate around the technologies you use most. Timestamp to Date Converter Timestamp to date converter.