True story: About 12 years ago in America, I came to a masjid a few minutes before sunset. A group of Muslims were preparing to leave, so I invited them to stay for Maghrib. They informed me that they had already prayed! So I walked outside with them and we looked at the sun just above the horizon. It was the day after the time change caused by Daylight Savings Time in the spring. So everyone put their clocks ahead by one hour, and apparently this was not reflected in the prayer schedule, so without paying attention to the sun’s position, they prayed according to the schedule ý a prayer that was not acceptable since it was offered before its legislated time!
PRAYER SCHEDULES – IMPORTANT RULINGS, GUIDELINE, AND CAUTIONS: http://www.salaficentre.com/2016/06/prayer-schedules-important-rulings-guideline-cautions/
Also in article:
– The legislated time for the five daily prayers (in accordance with the sun)
– The need for prayer schedules and benefits
– The permissibility and impermissibility of using prayer schedules