DATEADD in PostgreSQL - Examples & AI Generator

While DATEADD is a popular SQL function in other databases, such as SQL Server, PostgreSQL requires a different approach for date and time calculations. This often confuses developers and analysts used to the DATEADD keyword or shifting between database dialects. Instead of memorizing PostgreSQL's date math syntax, AI2sql generates precise, ready-to-use queries from your natural-language requests—no coding required. Save time and eliminate errors, whether you're updating reports or handling complex data transformations.

DATEADD Syntax in PostgreSQL

PostgreSQL does not support a DATEADD function directly. Instead, you add intervals to a date value using + and interval expressions:

-- General syntax:
SELECT date_column + INTERVAL 'value unit' FROM table_name;

• value: The numeric value to add (e.g., 7, 1, 30).

• unit: Time unit (e.g., day, month, year, hour).

This PostgreSQL-specific syntax is different from DATEADD in SQL Server and MySQL.

DATEADD Examples You Can Generate Instantly

Adapt these DATEADD PostgreSQL examples to real business scenarios, or let AI2sql build them for you in seconds:

Add 7 Days to Each Customer Signup Date

SELECT customer_id, signup_date + INTERVAL '7 days' AS follow_up_date
FROM customers;

Add 1 Month to Every Order Date

SELECT order_id, order_date + INTERVAL '1 month' AS renewal_due
FROM orders;

Add 2 Hours to Product Release Time

SELECT product_id, release_timestamp + INTERVAL '2 hours' AS event_end
FROM products;

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FAQ: DATEADD in PostgreSQL

Does PostgreSQL have a native DATEADD function?

No, PostgreSQL uses the INTERVAL keyword and arithmetic operators for adding to dates and times.

How do I subtract dates in PostgreSQL?

Subtract intervals using the - operator, for example: order_date - INTERVAL '3 days'.

What time units can I use with interval?

You can use day, month, year, hour, minute, and more in INTERVAL expressions.

Conclusion

The DATEADD concept in PostgreSQL is powerful but syntax-specific, often tripping up those switching from SQL Server or MySQL. With AI2sql, you get instant, production-ready queries tailored to business use—no memorization or manual coding. Generate your first query now in 10 seconds at AI2sql.