Hi Gmuli, if the HOUR is also relevant, I do use the solar time for date selection, for example with QMDJ.
One of my regular clients moves from city to city, or country to country. So, I have to adjust the timing of action based on their location. For example, in city A, they would take the action at 7:05-9:05 for the Chen hour. But in city B, they would take the action at 8:10-10:10 also for Chen hour.