strftime deprecated in php 8

[Hacky-The-Sheep]

PHP@8.1 shows the function strftime() is deprecated. When attempting to generate, causes errors.

Will look into the simplest way to ensure future compatibility.

[klimeryk]

Thanks for the heads-up - looks like IntlDateFormatter::format is the recommended new way. Would you be interested in submitting a PR to use it instead of strftime? 🙏

I used strftime originally because DateTime::format is not locale-dependent. But I did not notice there's IntlDateFormatter instead.