diff --git a/ext/equations-parser b/ext/equations-parser
index a210f5d..7428a00 160000
--- a/ext/equations-parser
+++ b/ext/equations-parser
@@ -1 +1 @@
-Subproject commit a210f5def5048ddd8e9095adeccfc27f39dd7811
+Subproject commit 7428a00a7e56f14afc9178de599e331bae71d17b
diff --git a/ext/libnativemath/extconf.rb b/ext/libnativemath/extconf.rb
index 97dba44..b0973e1 100644
--- a/ext/libnativemath/extconf.rb
+++ b/ext/libnativemath/extconf.rb
@@ -38,7 +38,7 @@
 end
 
 GIT_REPOSITORY = 'https://github.com/oxeanbits/equations-parser.git'.freeze
-COMMIT = 'a210f5def5048ddd8e9095adeccfc27f39dd7811'.freeze
+COMMIT = '7428a00a7e56f14afc9178de599e331bae71d17b'.freeze
 
 Dir.chdir(BASEDIR) do
   system('git init')
diff --git a/lib/parsec.rb b/lib/parsec.rb
index 5df2643..41eb82f 100644
--- a/lib/parsec.rb
+++ b/lib/parsec.rb
@@ -6,7 +6,7 @@ module Parsec
   class Parsec
     using StringToBooleanRefinements
 
-    VERSION = '0.14.2'.freeze
+    VERSION = '0.15.0'.freeze
 
     # evaluates the equation and returns only the result
     def self.eval_equation(equation)
diff --git a/parsec.gemspec b/parsec.gemspec
index 4fea56e..5cafc8c 100644
--- a/parsec.gemspec
+++ b/parsec.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name                  = 'parsecs'
-  s.version               = '0.14.2'
+  s.version               = '0.15.0'
   s.platform              = Gem::Platform::RUBY
   s.authors               = ['Nilton Vasques', 'Victor Cordeiro', 'Beatriz Fagundes']
   s.email                 = ['nilton.vasques@gmail.com', 'victorcorcos@gmail.com', 'beatrizsfslima@gmail.com']
diff --git a/test/test_parsec.rb b/test/test_parsec.rb
index 88cb816..3c337c5 100644
--- a/test/test_parsec.rb
+++ b/test/test_parsec.rb
@@ -391,4 +391,35 @@ def test_calculate
     assert_equal('One Two Three', parsec.eval_equation('calculate("\"One\" // \" \" // \"Two\" // \" \" // \"Three\"")'))
     assert_equal('3', parsec.eval_equation('calculate("number(calculate(\"1 + 1\")) + 1")'))
   end
+
+  def test_weekday
+    parsec = Parsec::Parsec
+    assert_equal(0, parsec.eval_equation('weekday("2021-03-21")'))
+    assert_equal(1, parsec.eval_equation('weekday("2016-03-21")'))
+    assert_equal(2, parsec.eval_equation('weekday("2017-03-21")'))
+    assert_equal(3, parsec.eval_equation('weekday("2018-03-21")'))
+    assert_equal(4, parsec.eval_equation('weekday("2019-03-21")'))
+
+    assert_equal(5, parsec.eval_equation('weekday("2014-03-21T21:03")'))
+    assert_equal(6, parsec.eval_equation('weekday("2015-03-21T21:03")'))
+
+    assert_equal('Søndag', parsec.eval_equation('weekday("2021-03-21", "nb")'))
+    assert_equal('星期一', parsec.eval_equation('weekday("2016-03-21", "zh-CN")'))
+    assert_equal('Mardi', parsec.eval_equation('weekday("2017-03-21", "fr-FR")'))
+    assert_equal('วันพุธ', parsec.eval_equation('weekday("2018-03-21", "th-TH")'))
+    assert_equal('Quinta-feira', parsec.eval_equation('weekday("2019-03-21", "pt-BR")'))
+
+    assert_raises(SyntaxError) { parsec.eval_equation('weekday("2019-03-21", "invalidlocale")') }
+    assert_raises(SyntaxError) { parsec.eval_equation('weekday("2024-32-21")') }
+    assert_raises(SyntaxError) { parsec.eval_equation('weekday("2024-09-17", "en", "one too many params")') }
+  end
+
+  def test_current_time
+    parsec = Parsec::Parsec
+    assert_raises(SyntaxError) { parsec.eval_equation('current_time("1"))') }
+    assert_match(/^([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]$/, parsec.eval_equation('current_time(5)'))
+    assert_match(/^([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]$/, parsec.eval_equation('current_time()'))
+    assert_match(/^([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]$/, parsec.eval_equation('current_time(-3)'))
+    assert_match(/^([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]$/, parsec.eval_equation('current_time(-200)'))
+  end
 end