Each chart is post-dated with the "week-ending" issue date four days after the charts are refreshed online (i.e., the following Saturday).The methods and policies by which this data is obtained and compiled have changed many times throughout the chart's history.
Billboard has also changed its Hot 100 policy regarding "two-sided singles" several times.
The Billboard Hot 100 is the music industry standard record chart in the United States for singles, published weekly by Billboard magazine.
Chart rankings are based on sales (physical and digital), radio play, and online streaming.
As of the issue for the week ending on April 7, 2018, the Hot 100 has had 1,071 different number one hits.
The current number one song is "God's Plan" by Drake.