when does a day start and end?
for example, let’s say laylatal qadr falls on 3/25/25.
does that mean that
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it starts at fajr time on 3/25/25, and ends at maghrib time on 3/25/25?
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it starts at maghrib time of 3/25/25, and ends at fajr time on 3/26/25?
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it started at maghrib time on 3/24/25, and ended at fajr time on 3/25/25?
Like most non muslim time is 24 hrs and their next day starts after 12 am
When does the new day begins in islam
Is it after maghreb because i heard my mom and many other people saying it
Just wanted to confirm
A lot of people are confused by this, especially when it comes to the 1st of Ramadhan. If in doubt, follow your local/national Muslim community as being in UNITY with the Ummah on decisions is more important (remember last year's Saudi's Eid debacle...).
I am not aware of any country that syncs clocks with the time for maghrib.
Apart from the immense confusion that such a practice would create, it would also require specialized clocks or periodic resetting since the time from one Maghrib to the next Maghrib is not 24 hours, but usually something like 23 hours 58 minutes or 24 hours 2 minutes, it constantly shifts throughout the year, going backwards in winter or forwards in summer.
A 'theological justification' for doing so is not needed as there is no obligation of keeping time in hours nor is there any religious matter in Islam that is dependent on a measure of time in hours.
This is not yet a comprehensive answer to the question.
But I have come across an example where the Islamic 'clock-time' begins at maghrib time: see 3:35 at https://www.youtube.com/watch?v=nil14BfjDdM&t=219s
So this informs that at the very least such practice exists.
What is still unanswered is the extent it exists, including in national or larger organisations, or in countries.
Also, the basis in hadith or Qur'an on how to form 'Islamic' time or calendar.