When working with PHP, you may need to read the UTC offset at a specific date-time. This guide explains the operation, shows what its arguments mean, and uses three separate examples to make the result easier to understand.
date_offset_get: The return value is seconds east of UTC and may change seasonally.
What Is date_offset_get in PHP?
Read the UTC offset at a specific date-time. The return value is seconds east of UTC and may change seasonally.
Syntax:
date_offset_get(DateTimeInterface $object): int
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: The offset is seconds, not milliseconds. A fixed offset does not describe complete DST rules.
Example 1: Basic Usage
This example introduces the operation with a short and predictable input.
<?php
$date = new DateTimeImmutable("2026-01-15", new DateTimeZone("Europe/Paris"));
echo date_offset_get($date);
Output:
3600
The code focuses on the main operation. The return value is seconds east of UTC and may change seasonally.
Example 2: Another Case
Now compare a different input, locale, date, or option to see another part of the behavior.
<?php
$date = new DateTimeImmutable("2026-07-15", new DateTimeZone("Europe/Paris"));
echo date_offset_get($date);
Output:
7200
What changes? The offset is seconds, not milliseconds. A fixed offset does not describe complete DST rules.
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
$zone = new DateTimeZone("America/New_York");
foreach (["2026-01-15", "2026-07-15"] as $day) {
$date = new DateTimeImmutable($day, $zone);
echo $day . ": " . (date_offset_get($date) / 3600) . " hours" . PHP_EOL;
}
Output:
2026-01-15: -5 hours
2026-07-15: -4 hours
The practical example demonstrates how to apply this operation to multiple values, a reusable task, or a validated input. The return value is seconds east of UTC and may change seasonally.
Important Behavior and Edge Cases
- Core behavior: The return value is seconds east of UTC and may change seasonally.
- Inputs and results: The offset is seconds, not milliseconds. A fixed offset does not describe complete DST rules.
- Alternatives: date_timezone_get() returns the zone object rather than the offset number.
Comparison With Related Functions
| Function or Approach | When to Use It |
|---|---|
date_offset_get | Read the utc offset at a specific date-time. |
| Related PHP approach | date_timezone_get() returns the zone object rather than the offset number. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Using an incorrect input or option | The offset is seconds, not milliseconds. A fixed offset does not describe complete DST rules. |
| Confusing this API with a related operation | date_timezone_get() returns the zone object rather than the offset number. |
| 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_offset_get helps you read the UTC offset at a specific date-time.
- The return value is seconds east of UTC and may change seasonally.
- The offset is seconds, not milliseconds. A fixed offset does not describe complete DST rules.
Use date_offset_get when you need to read the UTC offset at a specific date-time. 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.