One Calendar Day Vs 24 Hours. In general, a work day is a day on which you work, while the working day is that part of the day when you're at work: We divide the day into 24 hours, one hour into 60 minutes and one minute into 60 seconds.
The longest solar day of year is approximately 24 hours 0 min 30 seconds (occurs at mid to late december) while the shortest solar day of year is approximately 23. Across daylight saving time changes (with the session time zone set to a time zone that recognizes dst), this means interval ‘1 day’ does not necessarily equal.