How Can I Reliably Compare Dates in SQLite?

Ensuring Accurate Date Comparisons in SQLite

Directly comparing date strings in SQLite can produce unreliable query results due to SQLite's internal use of the Julian Day Number system. This article outlines a robust method for accurate date comparisons.

SQLite typically stores dates as text strings. However, comparing these strings directly often leads to inconsistencies. To guarantee accurate results, it's best practice to store dates in the YYYYMMDD format.

This format allows for simple and reliable date comparisons using standard SQL syntax:

<code class="language-sql">SELECT * 
FROM table_1 
WHERE mydate >= '20090101' AND mydate < '20100101';</code>

This query assumes mydate is a text field containing dates in YYYYMMDD format. The YYYYMMDD format avoids issues stemming from variations in time representation.

For improved user experience, consider implementing a data parser to convert user-supplied dates into the YYYYMMDD format before database insertion. This ensures consistent data formatting and reliable comparisons across all queries.

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