Hadith: The Hour will not be established until the time is shortened

عَنْ أَبِي هُرَيْرَةَ رضي الله عنه قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ:
«لَا تَقُومُ السَّاعَةُ حَتَّى يَتَقَارَبَ الزَّمَانُ، فَتَكُونَ السَّنَةُ كَالشَّهْرِ، وَيَكُونَ الشَّهْرُ كَالْجُمُعَةِ، وَتَكُونَ الْجُمُعَةُ كَالْيَوْمِ، وَيَكُونَ الْيَوْمُ كَالسَّاعَةِ، وَتَكُونَ السَّاعَةُ كَاحْتِرَاقِ السَّعَفَةِ الْخُوصَةُ».
[صحيح] - [رواه أحمد] - [مسند أحمد: 10943]

Abu Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said:
"The Hour will not be established until the time is shortened, so a year will be like a month, a month like a week, a week like a day, a day like an hour, and an hour will be like the burning of a palm leaf."
[Authentic hadith] - [Narrated by Ahmad] - [Musnad Ahmad - 10943]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informed that one of the signs of the Hour is the shortening of time. So, a year passes like a month, a month passes like a week, a week passes like a day, a day passes like one hour, and an hour passes so quickly like the burning of Sa‘afah, which is a palm leaf.