19th day of the month
19 days
十九日に届いた請求書を処理した。
I processed the invoice that arrived on the 19th.
十九日から連休が始まるので楽しみだ。
I'm looking forward to the holiday starting on the 19th.
毎月十九日は会員限定の割引日だ。
The 19th of every month is a members-only discount day.