diff --git a/Gemfile.lock b/Gemfile.lock
index 041b9a6..e608554 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -205,4 +205,4 @@ DEPENDENCIES
   yard
 
 BUNDLED WITH
-   2.4.3
+   2.4.19
diff --git a/lib/ruby_units/unit.rb b/lib/ruby_units/unit.rb
index 40e183f..9391e97 100644
--- a/lib/ruby_units/unit.rb
+++ b/lib/ruby_units/unit.rb
@@ -68,7 +68,7 @@ class << self
     STONE_LB_UNIT_REGEX = /(?:sts?|stones?)+[\s,]*(\d+)\s*(?:#|lbs?|pounds?|pound-mass)*/.freeze
     STONE_LB_REGEX     = /(\d+)\s*#{STONE_LB_UNIT_REGEX}/.freeze
     # Time formats: 12:34:56,78, (hh:mm:ss,msec) etc.
-    TIME_REGEX         = /(?<hour>\d+):(?<min>\d+):(?:(?<sec>\d+))?(?:,(?<msec>\d+))?/.freeze
+    TIME_REGEX         = /(?<hour>\d+):(?<min>\d+):?(?:(?<sec>\d+))?(?:,(?<msec>\d+))?/.freeze
     # Scientific notation: 1, -1, +1, 1.2, +1.2, -1.2, 123.4E5, +123.4e5,
     #   -123.4E+5, -123.4e-5, etc.
     SCI_NUMBER         = /([+-]?\d*[.]?\d+(?:[Ee][+-]?)?\d*)/.freeze
@@ -1600,7 +1600,6 @@ def parse(passed_unit_string = '0')
       end
       # ... and then strip the remaining brackets for x*y*z
       unit_string.gsub!(/[<>]/, '')
-
       if unit_string =~ TIME_REGEX
         hours, minutes, seconds, microseconds = unit_string.scan(TIME_REGEX)[0]
         raise ArgumentError, 'Invalid Duration' if [hours, minutes, seconds, microseconds].all?(&:nil?)
diff --git a/spec/ruby_units/unit_spec.rb b/spec/ruby_units/unit_spec.rb
index b90f019..9f01b4f 100644
--- a/spec/ruby_units/unit_spec.rb
+++ b/spec/ruby_units/unit_spec.rb
@@ -554,6 +554,80 @@
   end
 
   # Time
+  describe RubyUnits::Unit.new("1:00") do
+    it { is_expected.to be_an_instance_of Unit }
+
+    describe '#scalar' do
+      subject { super().scalar }
+
+      it { is_expected.to be_a(Numeric) }
+      it { is_expected.to be === 1 }
+    end
+
+    describe '#units' do
+      subject { super().units }
+
+      it { is_expected.to eq('h') }
+    end
+
+    it { is_expected.not_to be_temperature }
+    it { is_expected.not_to be_degree }
+    it { is_expected.not_to be_base }
+    it { is_expected.not_to be_unitless }
+    it { is_expected.not_to be_zero }
+  end
+
+  describe RubyUnits::Unit.new("1:23") do
+    it { is_expected.to be_an_instance_of Unit }
+
+    describe '#scalar' do
+      subject { super().scalar }
+
+      it { is_expected.to be_a(Numeric) }
+      it { is_expected.to be === 83/60r }
+    end
+
+    describe '#units' do
+      subject { super().units }
+
+      it { is_expected.to eq('h') }
+    end
+  end
+
+  describe RubyUnits::Unit.new("1:23:45") do
+    it { is_expected.to be_an_instance_of Unit }
+
+    describe '#scalar' do
+      subject { super().scalar }
+
+      it { is_expected.to be_a(Numeric) }
+      it { is_expected.to be === 67/48r }
+    end
+
+    describe '#units' do
+      subject { super().units }
+
+      it { is_expected.to eq('h') }
+    end
+  end
+
+  describe RubyUnits::Unit.new("1:23:45,67") do
+    it { is_expected.to be_an_instance_of Unit }
+
+    describe '#scalar' do
+      subject { super().scalar }
+
+      it { is_expected.to be_a(Numeric) }
+      it { is_expected.to be === 5025000067/3600000000r }
+    end
+
+    describe '#units' do
+      subject { super().units }
+
+      it { is_expected.to eq('h') }
+    end
+  end
+
   describe RubyUnits::Unit.new(Time.now) do
     it { is_expected.to be_an_instance_of Unit }