The Prophet ﷺ as saying: When the night approaches from this side and the day retreats on that side, and the sun sets - according to the version of Musaddad - he who fasts has reached the time to break it.
قَالَ النَّبِيُّ ﷺ إِذَا جَاءَ اللَّيْلُ مِنْ هَا هُنَا وَذَهَبَ النَّهَارُ مِنْ هَا هُنَا زَادَ مُسَدَّدٌ وَغَابَتِ الشَّمْسُ فَقَدْ أَفْطَرَ الصَّائِمُ