localtime in PHP: Usage and Examples

When a PHP application needs to uses localtime to process its supported input, choosing the right API and checking its results helps keep code understandable and dependable. This guide explains localtime with focused examples and important details.

What Is localtime in PHP?

localtime uses localtime to process its supported input. tm_year counts years since 1900 and tm_mon starts at zero.

Syntax:

localtime(timestamp, associative) : array

Parameters and return value: Parameters: <optional> ?int $timestamp = null; <optional> bool $associative = false. Check the return value or modified object rather than assuming the operation always succeeds.

Important: The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed.

Example 1: Basic Usage

Start with a compact input so the main operation is visible.

<?php

echo print_r(localtime(0,true));

Output:

Array
(
    [tm_sec] => 0
    [tm_min] => 0
    [tm_hour] => 0
    [tm_mday] => 1
    [tm_mon] => 0
    [tm_year] => 70
    [tm_wday] => 4
    [tm_yday] => 0
    [tm_isdst] => 0
)
1

Uses localtime to process its supported input. tm_year counts years since 1900 and tm_mon starts at zero.

Example 2: A Different Input

The next example changes the input or option to illustrate another behavior.

<?php

print_r(localtime(strtotime("2026-06-15")));

Output:

Array
(
    [0] => 0
    [1] => 0
    [2] => 0
    [3] => 15
    [4] => 5
    [5] => 126
    [6] => 1
    [7] => 165
    [8] => 0
)

Compare this result with the first example. tm_year counts years since 1900 and tm_mon starts at zero.

Practical Example: Applying the Function

This example combines the API with a realistic processing step and shows where to check its result.

<?php

$parts = localtime(time(),true);
echo ($parts["tm_year"]+1900) . "-" . ($parts["tm_mon"]+1);

Adapt the inputs to your application and validate the output before storing or displaying it. tm_year counts years since 1900 and tm_mon starts at zero.

Important Behavior and Edge Cases

Main purpose: Uses localtime to process its supported input.
Errors and boundaries: tm_year counts years since 1900 and tm_mon starts at zero.
Environment: The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed.

Comparison With Related Functions

Function or Approach	When to Use It
`localtime`	Uses localtime to process its supported input.
Related PHP functions	Consider this alternative when you need different behavior or a different abstraction.

Common Beginner Mistakes

Mistake	Correct Approach
Assuming the operation succeeds for every input	tm_year counts years since 1900 and tm_mon starts at zero.
Ignoring runtime requirements or variable output	The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed.
Using the wrong API for the goal	Compare localtime with Related PHP functions before selecting an approach.

Key Takeaways

Uses localtime to process its supported input.
tm_year counts years since 1900 and tm_mon starts at zero.
The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed.

Use localtime when you need to uses localtime to process its supported input. The three examples move from a simple call to a practical use. Validate all external input and handle failures explicitly.