When working with PHP, you may need to format a Unix timestamp with PHP format tokens. This guide explains the operation, shows what its arguments mean, and uses three separate examples to make the result easier to understand.
date: Uses the configured default PHP timezone to render a timestamp.
What Is date in PHP?
Format a Unix timestamp with PHP format tokens. Uses the configured default PHP timezone to render a timestamp.
Syntax:
date(string $format, ?int $timestamp = null): string
Parameters and return value: The signature above identifies the arguments and return type where the API has a single call. For topic guides, follow the sequence of calls in the examples. Always distinguish a returned value from an object or variable modified by reference.
Important: Date format tokens are case-sensitive, and time() is not the same as a UTC-formatted string.
Example 1: Basic Usage
This example introduces the operation with a short and predictable input.
<?php
echo date("Y-m-d", 1704067200);
Output:
2024-01-01
The code focuses on the main operation. Uses the configured default PHP timezone to render a timestamp.
Example 2: Another Case
Now compare a different input, locale, date, or option to see another part of the behavior.
<?php
echo gmdate("Y-m-d H:i", 1704067200);
Output:
2024-01-01 00:00
What changes? Date format tokens are case-sensitive, and time() is not the same as a UTC-formatted string.
Practical Example: Applying It in an Application
Use the following separate example as a starting point for a small application task. Check any extension or environment requirements below before running it.
<?php
$timestamps = [1704067200, 1704153600];
foreach ($timestamps as $timestamp) {
echo gmdate("Y-m-d", $timestamp) . PHP_EOL;
}
Output:
2024-01-01
2024-01-02
The practical example demonstrates how to apply this operation to multiple values, a reusable task, or a validated input. Uses the configured default PHP timezone to render a timestamp.
Important Behavior and Edge Cases
- Core behavior: Uses the configured default PHP timezone to render a timestamp.
- Inputs and results: Date format tokens are case-sensitive, and time() is not the same as a UTC-formatted string.
- Alternatives: gmdate() formats in UTC; IntlDateFormatter provides locale-aware output.
Comparison With Related Functions
| Function or Approach | When to Use It |
|---|---|
date | Format a unix timestamp with php format tokens. |
| Related PHP approach | gmdate() formats in UTC; IntlDateFormatter provides locale-aware output. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Using an incorrect input or option | Date format tokens are case-sensitive, and time() is not the same as a UTC-formatted string. |
| Confusing this API with a related operation | gmdate() formats in UTC; IntlDateFormatter provides locale-aware output. |
| Assuming output is identical across environments | Check return values and required extensions or versions. Use explicit locale, timezone or encoding settings when they affect the result. |
Key Takeaways
- date helps you format a Unix timestamp with PHP format tokens.
- Uses the configured default PHP timezone to render a timestamp.
- Date format tokens are case-sensitive, and time() is not the same as a UTC-formatted string.
Use date when you need to format a Unix timestamp with PHP format tokens. Start with the first example, compare the second, and adapt the practical example to your inputs. Confirm the return value and environment requirements before adding it to production code.