Sunnah mu'aqqadah is really a very desirable, verified Sunnah. If somebody routinely misses them without a valid rationale, he can have sin on him. For anyone who is following daylight saving time, the time of one's day-to-day prayers must be adjusted appropriately. The Muslim and Quran - Prayer Times cell https://finnatohz.blogoscience.com/41933291/facts-about-prayer-time-doha-today-revealed