TimeTrackingFormatter supports negative time

lib/gitlab/time_tracking_formatter.rb

@@ -24,6 +24,12 @@ module Gitlab
     end
 
     def output(seconds)
+      seconds.to_i < 0 ? negative_output(seconds) : positive_output(seconds)
+    end
+
+    private
+
+    def positive_output(seconds)
       ChronicDuration.output(
         seconds,
         CUSTOM_DAY_AND_MONTH_LENGTH.merge(
@@ -34,7 +40,9 @@ module Gitlab
       nil
     end
 
-    private
+    def negative_output(seconds)
+      "-" + positive_output(seconds.abs)
+    end
 
     def limit_to_hours_setting
       Gitlab::CurrentSettings.time_tracking_limit_to_hours

spec/lib/gitlab/time_tracking_formatter_spec.rb

@@ -47,5 +47,11 @@ RSpec.describe Gitlab::TimeTrackingFormatter do
 
       it { expect(subject).to eq('1w 1d 1h 40m') }
     end
+
+    context 'handles negative time input' do
+      let(:num_seconds) { -178_800 }
+
+      it { expect(subject).to eq('-1w 1d 1h 40m') }
+    end
   end
 end