From Pew Research
The gender gap in pay has narrowed since 1980, but it has remained relatively stable over the past 15 years or so. In 2017, women earned 82% of what men earned, according to a Pew Research Center analysis of median hourly earnings of both full- and part-time workers in the United States. Based on this estimate, it would take an extra 47 days of work for women to earn what men did in 2017.
By comparison, the Census Bureau found that full-time, year-round working women earned 80% of what their male counterparts earned in 2016.