The indicator shows the current day of the week as a histogram. The histogram rule matches the numbering of days in the MqlDateTime structure:
structMqlDateTime
  {
  int year;          // year
  int mon;            // month
  int day;            // day
  int hour;          // hour
  int min;            // minutes
  int sec;            // seconds  int day_of_week;    // day of the week (0-Sunday, 1-Monday, ... ,6-Saturday)
  int day_of_year;    // number of a day in the year (1st of January has number 0)
  };
The “Days of the week” indicator can be applied on the D1 timeframe together with “Volumes” indicator for a visual search of dependencies between days of the week and volumes:
Fig. 1. An example of a combination of “Days of the week” and “Volumes”
