[tison]

Could you elaborate a bit on the issue? I'm not sure you are commenting on cronexpr or other libraries.

In cronexpr, there is no requirement for a timestamp until you'd like to find the next scheduled time, and thus you need to provide a related point.

To decouple with certain datetime lib, I made a `MakeTimestamp` struct which provides multiple constructors. Later, I found it somehow like a function overload :D