Today, April 12th, is National Equal Pay Day. Although the date of this day changes every year, the reason for it stays the same.

This is a day determined each year by analyzing how far into the year women have to work to earn what men did the previous year. And, according to the Department of Labor, that day is today.

Take a second and think about this. In order to earn what the average man made in 2015, a woman has to work an additional three and a half months into the new year.

Since 1996, the National Committee on Pay Equity has been tracking how long a woman would need to work to make the same amount as a man as a way to highlight the gap in pay and raise public awareness.

The National Committee on Pay Equity encourages those who'd like to see more equal pay across the board, regardless of gender, to wear red today.