Hi, I want to develop a class which I can use without building an instance, like String. I want to use the class for conversation, e.g. "Serial.println (dateConvert (ulong unixEpoch).toMyFormat())", the output is as String. How can I setup such a class? regards Frank

Use class without instance (like e.g. String)

build_1971 June 1, 2025, 6:00pm 5

My guess is that OP is looking for static member function.

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