How to Convert Numeric Week Representation to a Gregorian Date in MySQL?

Exchanging Numeric Week Representation into Gregorian Date

Converting the representation of a week as an integer into a specific date can be a common need in various applications. For instance, obtaining the Tuesday of a calendar week can aid in scheduling or data analysis.

MySQL Solution

MySQL offers a powerful function, STR_TO_DATE(), that enables the direct conversion from a week number representation into a date. This function takes two parameters:

1. A string representing the date and week information in the format of "Year Week Day".
2. A format string specifying the expected elements order in the input string.

Example

Suppose we intend to retrieve the Tuesday of the 32nd week of 2013. We can execute the following SQL query:

SELECT STR_TO_DATE('2013 32 Tuesday', '%X %V %W');

This query will produce an output in the format of 'YYYY-MM-DD', which in this case would be:

'2013-08-13'

Explanation

The STR_TO_DATE() function interprets the input string '2013 32 Tuesday' as follows:

• '%X' represents the year, which is 2013 in this case.
• '%V' represents the week number, which is 32.
• '%W' represents the day of the week, which is Tuesday.

The function then translates this information into the Gregorian date '2013-08-13', which corresponds to the Tuesday of the 32nd week of 2013.

Conclusion

The STR_TO_DATE() function offers a convenient and concise solution for converting week number representations into dates in MySQL. It eliminates the need for complex date calculations, making it a highly efficient and straightforward approach.

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