REF: share code for scalar validation in datetimelike array methods
The user-facing effect here is in the exception messages we show to users, where we may want to be more verbose than this.  Thoughts @gfyoung?
> The user-facing effect here is in the exception messages we show to users, where we may want to be more verbose than this. Thoughts @gfyoung?

I agree that we would want to improve the user-friendliness of these error messages.  From that perspective, I prefer the error messages that were there before.