1. What is DATE_ADD in SQL?

The DATE_ADD function in SQL adds a specified time interval to a date. It's commonly used for date arithmetic in database queries and is supported by most SQL database systems including MySQL, MariaDB, and SQL Server (with slightly different syntax).

2. How Does the Calculator Work?

The calculator uses the DATE_ADD function with a 6-month interval:

Where:

• \( date \) — The starting date value
• \( \text{INTERVAL 6 MONTH} \) — Specifies the amount to add (6 months)

Explanation: The function handles month boundaries correctly, so adding 6 months to August 31 would result in February 28 (or 29 in a leap year).

3. Importance of Date Calculations

Details: Date arithmetic is essential for many database operations including subscription renewals, financial calculations, and reporting periods. Accurate date handling ensures correct business logic in applications.

4. Using the Calculator

Tips: Enter any valid date in YYYY-MM-DD format. The calculator will show the date 6 months later and generate the corresponding SQL query.

5. Frequently Asked Questions (FAQ)

Q1: Does this work in all SQL databases?
A: The syntax shown is for MySQL/MariaDB. In SQL Server, use DATEADD(month, 6, date). In PostgreSQL, use date + INTERVAL '6 months'.

Q2: How does it handle month-end dates?
A: If the resulting month has fewer days, it returns the last day of that month (e.g., Jan 31 + 1 month = Feb 28/29).

Q3: Can I calculate other intervals?
A: Yes, you can change "6 MONTH" to other intervals like "1 YEAR", "15 DAY", etc.

Q4: What about time zones?
A: DATE_ADD operates on the date value without timezone conversion. For timezone-aware calculations, use appropriate functions.

Q5: Is there a DATE_SUB function?
A: Yes, DATE_SUB subtracts intervals. Alternatively, you can use DATE_ADD with negative intervals.