Add SQL Dates entry for 'CURRENT_TIMESTAMP()'

content/sql/concepts/dates/terms/current-timestamp/current-timestamp.md

@@ -0,0 +1,89 @@
+---
+Title: 'CURRENT_TIMESTAMP'
+Description: 'Returns the current date and time.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Database'
+  - 'Queries'
+  - 'MySQL'
+CatalogContent:
+  - 'learn-sql'
+  - 'paths/analyze-data-with-sql'
+---
+
+The **`CURRENT_TIMESTAMP`** function returns the current date and time in the string format `YYYY-MM-DD HH:MM:SS`.
+
+## Syntax
+
+```pseudo
+CURRENT_TIMESTAMP
+```
+
+**Parameters:**
+
+`CURRENT_TIMESTAMP` does not accept any parameters in standard SQL implementations.
+
+**Return value:**
+
+Returns the current date and time as a `DATETIME` value (in SQL Server) or `TIMESTAMP` value (in other systems) in the format `YYYY-MM-DD HH:MM:SS.mmm`.
+
+## Example 1: Basic Usage
+
+In this example, `CURRENT_TIMESTAMP` retrieves the current date and time from the database server:
+
+```sql
+SELECT CURRENT_TIMESTAMP;
+```
+
+A possible output of this code is:
+
+```shell
+2026-01-21 19:39:23
+```
+
+## Example 2: Using as Default Value
+
+In this example, `CURRENT_TIMESTAMP` is used as a default value for the `order_date` column, automatically capturing the timestamp when a new record is inserted:
+
+```sql
+CREATE TABLE orders (
+  order_id INT PRIMARY KEY,
+  order_date DATETIME DEFAULT CURRENT_TIMESTAMP,
+  product_name VARCHAR(100)
+);
+
+INSERT INTO orders (order_id, product_name) 
+VALUES (1, 'Laptop');
+
+SELECT * FROM orders;
+```
+
+The output shows that the `order_date` was automatically populated:
+
+```shell
+order_id    order_date              product_name                                                                                        
+----------- ----------------------- ----------------------------------------------------------------------------------------------------
+          1 2026-01-22 11:43:29.737 Laptop
+```
+
+## Example 3: Comparing Timestamps
+
+In this example, `CURRENT_TIMESTAMP` is used with [`DATEDIFF()`](https://www.codecademy.com/resources/docs/sql/dates/datediff) to calculate how many minutes have elapsed since an order was placed:
+
+```sql
+SELECT 
+  order_id,
+  product_name,
+  DATEDIFF(minute, order_date, CURRENT_TIMESTAMP) AS minutes_ago
+FROM orders;
+```
+
+The output of this code is:
+
+```shell
+order_id | product_name | minutes_ago
+---------|--------------|------------
+1        | Laptop       | 120
+```