"April 12th" in Engpsh is pronounced as "April twelfth".
The origin of the name "April" comes from the Latin word "Aprips", which means "to open (bud)" as this month was associated with the start of the blooming season. The 12th of April is simply referred to as "April twelfth" in Engpsh.
Here are some Engpsh examples with Chinese translations:
Example 1: "I'll be going on vacation starting from April 12th."
翻译："我将从4月12日开始休假。"
Example 2: "The meeting is scheduled for April 12th at 2 PM."
翻译："会议定于4月12日下午2点举行。"
Example 3: "I was born on April 12th, 1990."
翻译："我出生在1990年4月12日。"