which country support DST timezone in php ?

Can you give an example? I mean, Denmark has DST. But give en example of an input and expected output, and I will help you find the correct Carbon syntax.

@sinnbeck thank you for reply

my client send me details like

What is Daylight Saving, and in which countries it is applicable?

so futher i dont write any code for this just know which countries is support DST?

Here is a list of countries not using DST. All others are :)

https://greenwichmeantime.com/countries/

And dst for all countries

https://en.wikipedia.org/wiki/Daylight_saving_time_by_country