noun
28th day of the month
Refers to the 28th day of any month. Often used in dates and schedules.
会議は２８日に行われます。
The meeting will be held on the 28th.
noun
28 days
Indicates a period of 28 days. Often used in contexts like deadlines, durations, or cycles.
この薬は２８日分あります。
This medicine is for 28 days.
Compound of 二十八 (にじゅうはち, twenty-eight) + 日 (にち, day).