diff --git a/.github/workflows/build_nix.yml b/.github/workflows/build_nix.yml
new file mode 100644
index 0000000..f2c07f0
--- /dev/null
+++ b/.github/workflows/build_nix.yml
@@ -0,0 +1,19 @@
+name: ubuntu-latest
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: "Build/Test" # contains slash so use quotes otherwise UB
+      run: |
+        curl -Lo mkn https://github.com/mkn/mkn/releases/download/latest/mkn_nix
+        chmod +x mkn
+        KLOG=3 ./mkn clean build test run -dtOa "-std=c++17 -fPIC"
diff --git a/.github/workflows/build_osx.yml b/.github/workflows/build_osx.yml
new file mode 100644
index 0000000..8fd30d2
--- /dev/null
+++ b/.github/workflows/build_osx.yml
@@ -0,0 +1,19 @@
+name: macos-latest
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: "Build/Test" # contains slash so use quotes otherwise UB
+      run: |
+        curl -Lo mkn https://github.com/mkn/mkn/releases/download/latest/mkn_osx
+        chmod +x mkn
+        KLOG=3 ./mkn clean build test run -dtOa "-std=c++17 -fPIC"
diff --git a/.github/workflows/build_win.yml b/.github/workflows/build_win.yml
new file mode 100644
index 0000000..ce2eada
--- /dev/null
+++ b/.github/workflows/build_win.yml
@@ -0,0 +1,26 @@
+name: windows-latest
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - uses: ilammy/msvc-dev-cmd@v1
+      with:
+        arch: amd64
+
+    - name: "Build/Test" # contains slash so use quotes otherwise UB
+      shell: cmd
+      env:
+        MKN_CL_PREFERRED: 1
+      run: | # /bin/link interferes with cl/link.exe
+        bash -c "rm /bin/link"
+        bash -c "curl -Lo mkn.exe https://github.com/mkn/mkn/releases/download/latest/mkn.exe"
+        bash -c 'KLOG=3 ./mkn clean build run -dtKOp test -a "-EHsc -std:c++17"'
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f4aa9f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+bin
+.mkn
+tc
diff --git a/mkn.yaml b/mkn.yaml
new file mode 100644
index 0000000..5a47f1a
--- /dev/null
+++ b/mkn.yaml
@@ -0,0 +1,17 @@
+#! clean build test run -O 2
+
+name: time.ccronexpr
+version: master
+parent: lib
+
+profile:
+- name: lib
+  inc: tc
+  src: tc/ccronexpr.c
+  test: tc/ccronexpr_test.c
+  sub: tinycron&tc(https://github.com/exander77/supertinycron)
+
+- name: stc
+  self: lib
+  main: tc/supertinycron.c
+  out: supertinycron