%
% stack: time-back time-from
%
% bias is in hh:mm format, hours optional
%
  dup Time.Timels pop 2 prezero
%
% set end time range
%
  ^":" & !Customer.Etime
  exch minus "n" Time.Add
  Time.Timels pop 2 prezero
%
% set start time range
%
  ^":" & !Customer.Stime