Adding 1 to a Date Gives the Next Day on PostgreSQL and a Number on MySQL and SQLite

Mon, 26 Oct 2026 00:00:00 +0000

due_date + 1 reads like the day after, and on PostgreSQL that is what it gives. On MySQL, MariaDB and SQLite the answer is a plain number.

MySQL and MariaDB turn the date into the number 20240131 and add 1. SQLite turns the text into the number 2024. PostgreSQL adds a day. Subtracting two dates goes the same way: PostgreSQL counts days and MySQL and MariaDB subtract the numbers. INTERVAL arithmetic works on PostgreSQL, MySQL and MariaDB, with different result types, and SQLite has no INTERVAL. PostgreSQL’s usual INTERVAL '1 day', with the unit inside the quotes, works on PostgreSQL only.

CAST to DATE Returns the Number 2024 on SQLite Because It Has No Date Type

Mon, 26 Oct 2026 00:00:00 +0000

Filtering orders with CAST(created_at AS DATE) = '2024-05-06' works on PostgreSQL, MySQL and MariaDB. SQLite has no date type, turns the CAST into a number and keeps only the year, so the filter never matches.

SQLite keeps dates as text or numbers and reads a CAST to DATE, DATETIME or TIMESTAMP as a conversion to a number, which keeps only the leading digits. MySQL and MariaDB also refuse CAST(x AS TIMESTAMP), and PostgreSQL refuses DATETIME.

Dates on BareSQL.com

Adding 1 to a Date Gives the Next Day on PostgreSQL and a Number on MySQL and SQLite

CAST to DATE Returns the Number 2024 on SQLite Because It Has No Date Type