The term FIRST 30-DAY MO. is referring to the job of an April (APR) which is a three letter acronym. April is the fourth month of the year and is often referred to as the first month of spring. The FIRST 30-DAY MO. is a job that requires someone to work for the first thirty days of April. This job is usually associated with seasonal work such as landscaping, gardening, or other outdoor activities.