如何在 SQL 中将时间戳转换为日期？

Question

Image: http://i.stack.imgur.com/CyyHo.jpg

I have a dataset as shown in the image. I want to use the values of created_date column as datetime format. How can i do that?

Answer 1

The time you would like to convert is called Unix timestamp , which means how many seconds have passed since 1970/01/01. In this occasion you will have to use DATA function, which will take the total number of seconds and add them to 1970/01/01.

In SQL it is done in the following way:

select DATEADD(s, dateTimeInSeconds, '19700101')

Where s is Seconds and dateTimeInSeconds is your value of date; '19700101' is a starting point.

Answer 2

Is created_date of type 'epoch'? And are you trying to use the datetime format within the SQL database or within your business logic? If it is in the business logic, it then depends on the language you use. I'd love to help but I don't fully understand the use case. If you could provide more information that would help us help you!

Cheers!

Answer 3

It doesn't look like unix timestamp but datetime without some chars (just digits are left).

To get "real" timestamp use in MySql: unix_timestamp()

To convert "real" timestamp to datetime use in MySql: FROM_UNIXTIME()

To convert your column to datetime use:

    CONCAT(SUBSTR(created_date, 1, 4),
        '-',
        SUBSTR(created_date, 5, 2),
        '-',
        SUBSTR(created_date, 6, 2),
        ' ',
        SUBSTR(created_date, 7, 2),
        ':',
        SUBSTR(created_date, 11, 2),
        ':',
        SUBSTR(created_date, 13, 2))

Answer 4

Column values does not seems to be a TimeStamp. Use the below script to make the values as datetime .

    SELECT credits,amount,city,
                  CONVERT(DATETIME,LEFT(created_date,8)
                  +' '+SUBSTRING(created_date,9,2)
                  +':'+SUBSTRING(created_date,11,2)
                  +':'+RIGHT(created_date,2)) Created_Date
    FROM YourTable