We usually say ”” or "{}"and add "" or "" in conversation. You may also add "{} - these days" to before "”” and "{}."
Though ”” refers to phisical shortness of the length of a day, and "{}" rather connotes your feeling of the quick passage of time, both phrases are often used in the greeting in our conversation.
sounds awkward and illogical because a day can't be short only on a single day around this time of the year.