April 12, 2016 was Equal Pay Day. In 2015, Equal Pay Day was on April 14th. In 2013, it was on April 9th. Why? The date moves not with the day of the week or the calendar, but based on what the gender pay gap is for the previous year. In 2015, a woman would have had to continue working until April 12, 2016 to make the same salary a man did in the year 2015.