The year 2020 (MMXX) was a leap year starting on Wednesday of the Gregorian calendar, the 2020th year of the Common Era (CE) and Anno Domini (AD) designations, the 20th year of the 3rd millennium and the 21st century, and the 1st year of the 2020s decade.
The year AD 88 (LXXXVIII) was a leap year starting on Tuesday of the Julian calendar, the 88th year of the Common Era (CE) and Anno Domini (AD) designations, the 988th year of the 1st millennium, the 88th year of the 1st century, and the 9th year of the 80s decade. As of the start of 88, the Gregorian calendar was 2 days behind the Julian calendar, which was the dominant calendar of the time.