It's 2017 and still, on average, women don't earn as much as men.
In 2015, female full-time, year-round workers in the U.S made only 80 cents for every dollar earned by men, a gender wage gap of 20%, according to the non-profit Institute for Women's Policy Research (IWPR).
If change continues at the current pace, IWPR predicts it will take until 2059 for women to reach pay parity - and for women of color, the rate of change is even slower.
Equal Pay Day is a symbolic day marking how far into a year women would have to work in order to earn the same amount men earned the year before. Ultimately, it would take until April 4, or 44 days into 2017, for women to make the same as men did in 2016.
It is also an opportunity to draw attention to other issues about which families care, such as paid leave and flexible working.
Many companies are working towards gender equality and diversity in the workplace. Learn more about these employers now.
Disclosure: Where Women Work researches and publishes insightful evidence about how its paid member organizations support women's equality.