Convert Integer field Date time to Date Time - sql-server

Question

I am working in SQL Server 2012. My datetime column in a data set looks like this: 1512543210. The column is in int. I want to convert it to something like dd-mm-yyyy hh:mm:ss e.g. 01-01-2019 12:12:12. But I can not do this. I am using following code:
select dateadd(SS, 1512543210, '01/01/1970 00:00:00') as datetime
from sampledb
after execute query i got this.
2017-12-06 00:00:00.0
but i want this format;
06-12-2017 00:00:00

Answer 1

You can use DATEADD to convert UNIX timestamp to DATETIME and FORMAT function to format it:
SELECT FORMAT(DATEADD(SECOND, 1512543210, '19700101'), 'dd-MM-yyyy hh:mm:ss')
-- 06-12-2017 06:53:30
Having said that, Java has DateTimeFormatter class for formatting dates. And timestamps could be used to construct date objects directly.

Answer 2

You can use the CONVERT option
select CONVERT(varchar,dateadd(SS,DateTime,'01/01/1970 00:00:00') ,21) as datetime from sampledb

Answer 3

You can convert it in the database query as stated in comments and at least one other answer, but you can do it in Java, too:
Have a look at this example:
public static void main(String args[]) {
// take the moment represented by the int from the database
Instant instant = Instant.ofEpochSecond(1512543210);
// create a datetime object (modern java api)
LocalDateTime ldt = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
// create a formatter for the pattern of your choice
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss");
// then print the datetime using the desired format
System.out.println(ldt.format(dtf));
}
This outputs
06-12-2017 07:53:30
in my IDE, please check that code in yours.
Please note that you don't need to do the DATEADD operation in SQL for this, just fetch the int value from the database by something like resultSet.getInt(...) and pass it to the Instant.ofEpochSeconds(...), it will calculate the time based on "1970-01-01 00:00:00".

Answer 4

Try this..
select FORMAT(dateadd(SS,1512543210,'01/01/1970 00:00:00'), N'MM-dd-yyyy hh:mm:ss')

Answer 5

If you're on an older version of SQL Server, the format function is not available. An alternative is convert with style 105 (Italian) to get the MM-dd-yyyy part. Then you can take the last part of the 120 (odbc canonical) style to get the hh:mm:ss part:
select convert(varchar(30), dateadd(second, 1512543210, '1970-01-01'), 105) + ' ' +
substring(convert(varchar(30), dateadd(second, 1512543210, '1970-01-01'), 20), 12, 8)
-->
06-12-2017 06:53:30
Example at rextester.