diff --git a/lib/business_time/config.rb b/lib/business_time/config.rb
index d9e6dbb..e1eb907 100644
--- a/lib/business_time/config.rb
+++ b/lib/business_time/config.rb
@@ -8,6 +8,7 @@ module BusinessTime
   class Config
     DEFAULT_CONFIG = {
       holidays:              SortedSet.new,
+      forced_workdays:       SortedSet.new,
       beginning_of_workday:  ParsedTime.parse('9:00 am'),
       end_of_workday:        ParsedTime.parse('5:00 pm'),
       work_week:             %w(mon tue wed thu fri),
@@ -104,6 +105,12 @@ def threadsafe_cattr_setter(name)
     # someplace in the initializers of your application.
     threadsafe_cattr_accessor :holidays
 
+    # You can set this yourself, either by the load method below, or
+    # by saying
+    #   BusinessTime::Config.forced_workdays << my_forced_workday_date_object
+    # someplace in the initializers of your application.
+    threadsafe_cattr_accessor :forced_workdays
+
     # working hours for each day - if not set using global variables :beginning_of_workday
     # and end_of_workday. Keys will be added ad weekdays.
     # Example:
@@ -174,6 +181,10 @@ def load(file)
         (config["holidays"] || []).each do |holiday|
           holidays << Date.parse(holiday)
         end
+
+        (config["forced_workdays"] || []).each do |forced_workday|
+          forced_workdays << Date.parse(forced_workday)
+        end
       end
 
       def with(config)
diff --git a/lib/business_time/time_extensions.rb b/lib/business_time/time_extensions.rb
index 11127bc..40c77ac 100644
--- a/lib/business_time/time_extensions.rb
+++ b/lib/business_time/time_extensions.rb
@@ -3,7 +3,8 @@ module TimeExtensions
     # True if this time is on a workday (between 00:00:00 and 23:59:59), even if
     # this time falls outside of normal business hours.
     def workday?
-      weekday? && !BusinessTime::Config.holidays.include?(to_date)
+      BusinessTime::Config.forced_workdays.include?(self) ||
+        (weekday? && !BusinessTime::Config.holidays.include?(to_date))
     end
 
     # True if this time falls on a weekday.
diff --git a/test/test_config.rb b/test/test_config.rb
index 3a7fca8..238fa76 100644
--- a/test/test_config.rb
+++ b/test/test_config.rb
@@ -93,6 +93,17 @@
     assert !Time.parse('2012-05-07').workday?
   end
 
+  it "include forced workdays read from YAML config file" do
+    yaml = <<-YAML
+      business_time:
+        forced_workdays:
+          - April 28th, 2018
+    YAML
+    config_file = StringIO.new(yaml.gsub!(/^    /, ''))
+    BusinessTime::Config.load(config_file)
+    assert BusinessTime::Config.forced_workdays.to_a == [Date.new(2018, 4, 28)]
+  end
+
   it "use defaults for values missing in YAML file" do
     yaml = <<-YAML
     business_time:
diff --git a/test/test_date_extensions.rb b/test/test_date_extensions.rb
index b25d940..38d20ef 100644
--- a/test/test_date_extensions.rb
+++ b/test/test_date_extensions.rb
@@ -30,6 +30,13 @@
     assert(!july_5.workday?)
   end
 
+  it "know a forced_workday is a workday" do
+    april_28 = Date.parse("April 28, 2018")
+    assert(!april_28.workday?)
+    BusinessTime::Config.forced_workdays << april_28
+    assert(april_28.workday?)
+  end
+
   it "#week" do
     assert_equal  1, Date.parse("Jan 1, 2017").week
     assert_equal  1, Date.parse("Jan 7, 2017").week