v0.0.6 Removed never thrown InvalidArgumentException

Check if $timestamp is DateTimeInterface instance before treating it as integer or string.
InvalidArgumentException is never thrown

Tranks to @TiberiuD

v0.0.5 Try to use LC_TIME locale if locale param is empty

Using LC_TIME locale if possible will make the function more compatible to the current behaviour.

The Locale class also supports identifiers with dashes and may be more than 5 characters; see https://www.php.net/manual/en/class.locale.php

Thanks to @the-mars

v0.0.4

Add support for modifiers to remove leading zeros or convert to spaces #1
Thanks to @the-mars

v0.0.3

ICU requirement added

v0.0.2

Fix autoload

v0.0.1

First release