１３日じゅうさんにち

noun

13th day of the month

Used to specify the 13th day of any month. Often appears in dates like １３日（じゅうさんにち）.

• 会かい議ぎは１３日にちに行おこなわれます。

  The meeting will be held on the 13th.

noun

13 days

Used to express a duration of 13 days. Often followed by a counter or in phrases like １３日間.