Maghrib prayer is performed just after sunset. The time for Maghrib begins right after the sun sets and lasts until the beginning of the night prayer (Isha).
For example, today in Sharjah, UAE, Maghrib is at 6:45 PM. In Den Haag, Netherlands, Maghrib is at 8:44 PM. Times vary by location but the principle remains the same: Maghrib starts immediately after sunset.
