If the meaning is “since Friday,” the expression names the starting point, not the total number of days. The source’s criterion is whether it answers “since when?”
Book example: مَا رَأَيْتُهُ مُنْذُ يَوْمِ الْجُمُعَةِ.
I have not seen him since Friday.
Mā: negator; raʾaytu: past verb and subject; -hu: object; mundhu: preposition marking the start here; yawmi: genitive noun and muḍāf; al-jumuʿati: genitive complement.
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Indeclinable Adverbs — Ghāyāt, Time and Place
If the meaning is “since Friday,” the expression names the starting point, not the total number of days. The source’s criterion is whether it answers “since when?”
Book example: مَا رَأَيْتُهُ مُنْذُ يَوْمِ الْجُمُعَةِ.
I have not seen him since Friday.
Mā: negator; raʾaytu: past verb and subject; -hu: object; mundhu: preposition marking the start here; yawmi: genitive noun and muḍāf; al-jumuʿati: genitive complement.