diff --git a/lib/et-orbi/time.rb b/lib/et-orbi/time.rb
index cf531e9..8e3a047 100644
--- a/lib/et-orbi/time.rb
+++ b/lib/et-orbi/time.rb
@@ -201,7 +201,7 @@ def to_debug_s
       uo = self.utc_offset
       uos = uo < 0 ? '-' : '+'
       uo = uo.abs
-      uoh, uom = [ uo / 3600, uo % 3600 ]
+      uoh, uom = [ uo / 3600, (uo % 3600) / 60 ]
 
       [
         'ot',
diff --git a/lib/et-orbi/zone.rb b/lib/et-orbi/zone.rb
index 4eb868b..5faf966 100644
--- a/lib/et-orbi/zone.rb
+++ b/lib/et-orbi/zone.rb
@@ -43,7 +43,7 @@ def get_offset_tzone(str)
 
       hr = nil if hr.abs > 11
       hr = nil if mn > 59
-      mn = -mn if hr && hr < 0
+      mn = -mn if m[1].start_with?('-')
 
       hr ?
         custom_tzs[str] = create_offset_tzone(hr * 3600 + mn * 60, str) :
@@ -85,7 +85,7 @@ def to_offset(n)
 
       i = n.to_i
       sn = i < 0 ? '-' : '+'; i = i.abs
-      hr = i / 3600; mn = i % 3600; sc = i % 60
+      hr = i / 3600; mn = (i % 3600) / 60; sc = i % 60
 
       sc > 0 ?
         '%s%02d:%02d:%02d' % [ sn, hr, mn, sc ] :
diff --git a/test/module_test.rb b/test/module_test.rb
index 0e07d30..1855e9e 100644
--- a/test/module_test.rb
+++ b/test/module_test.rb
@@ -447,6 +447,17 @@
       end
     end
 
+    test 'handles fractional-hour offsets' do
+
+      assert EtOrbi.get_tzone(19_800).name, '+05:30'
+      assert EtOrbi.get_tzone(-1_800).name, '-00:30'
+      assert EtOrbi.get_tzone('-00:30').name, '-00:30'
+
+      assert(
+        EtOrbi::EoTime.new(0, 19_800).to_debug_s,
+        'ot 1970-01-01 05:30:00 +05:30 dst:false')
+    end
+
 #    test 'returns a timezone for well-known abbreviations' do
 #
 #      assert gtz('JST'), 'Japan'