May by
```php
Date::formatted_time($message['time'], Log_Writer::$timestamp, Log_Writer::$timezone);
```
instead
```php
Date::formatted_time('@'.$message['time'], Log_Writer::$timestamp, Log_Writer::$timezone, TRUE);
```
**?**

Method `Date::formatted_time` should take 3 arguments, not 4:
```php
public static function formatted_time($datetime_str = 'now', $timestamp_format = NULL, $timezone = NULL)
```
And I do not understand why `@`

Thanks