diff --git a/.github/workflows/node-4+.yml b/.github/workflows/node-4+.yml
new file mode 100644
index 0000000..1786d22
--- /dev/null
+++ b/.github/workflows/node-4+.yml
@@ -0,0 +1,91 @@
+name: 'Tests: node.js'
+
+on: [pull_request, push]
+
+jobs:
+  matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      latest: ${{ steps.set-matrix.outputs.requireds }}
+    steps:
+      - uses: ljharb/actions/node/matrix@main
+        id: set-matrix
+        with:
+          versionsAsRoot: true
+          type: 'majors'
+          preset: '>=4'
+
+  latest:
+    needs: [matrix]
+    name: 'latest majors'
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: ${{ fromJson(needs.matrix.outputs.latest) }}
+        include:
+          - node-version: '14.'
+            env:
+              TZ: America/New_York
+          - node-version: '13.'
+            env:
+              TZ: Europe/London
+          - node-version: '12.'
+            env:
+              TZ: Asia/Seoul
+          - node-version: '11.'
+            env:
+              TZ: America/Los_Angeles
+              FMTS: misc
+          - node-version: '10.'
+            env:
+              TZ: Europe/Berlin
+              FMTS: misc
+          - node-version: '9.'
+            env:
+              TZ: Asia/Kolkata
+              FMTS: misc
+          - node-version: '8.'
+            env:
+              TZ: Asia/Shanghai
+              FMTS: misc
+          - node-version: '7.'
+            env:
+              TZ: America/Cancun
+              FMTS: misc
+          - node-version: '6.'
+            env:
+              TZ: Asia/Seoul
+              FMTS: misc
+          - node-version: '5.'
+            env:
+              TZ: America/Anchorage
+              FMTS: misc
+          - node-version: '4.'
+            env:
+              TZ: America/Barbados
+              FMTS: misc
+          - node-version: '4.4.7' # see GH issue #1150
+            env:
+              TZ: Asia/Tokyo
+              FMTS: misc
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ljharb/actions/node/install@main
+        name: 'nvm install ${{ matrix.node-version }} && npm install'
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: sudo curl -Lo /usr/bin/rooster https://github.com/SheetJS/rooster/releases/download/v0.2.0/rooster-v0.2.0-linux-amd64
+      - run: sudo chmod a+x /usr/bin/rooster
+      - run: make init
+      - run: 'cd test_files; make all; cd -'
+      - run: npm run test
+
+  node:
+    name: 'node 4+'
+    needs: [latest]
+    runs-on: ubuntu-latest
+    steps:
+      - run: 'echo tests completed'
diff --git a/.github/workflows/node-iojs.yml b/.github/workflows/node-iojs.yml
new file mode 100644
index 0000000..96410ee
--- /dev/null
+++ b/.github/workflows/node-iojs.yml
@@ -0,0 +1,45 @@
+name: 'Tests: node.js (io.js)'
+
+on: [pull_request, push]
+
+jobs:
+  matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      latest: ${{ steps.set-matrix.outputs.requireds }}
+    steps:
+      - uses: ljharb/actions/node/matrix@main
+        id: set-matrix
+        with:
+          type: 'majors'
+          preset: 'iojs'
+
+  latest:
+    needs: [matrix]
+    name: 'latest majors'
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix: ${{ fromJson(needs.matrix.outputs.latest) }}
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ljharb/actions/node/install@main
+        name: 'nvm install ${{ matrix.node-version }} && npm install'
+        with:
+          node-version: ${{ matrix.node-version }}
+          skip-ls-check: true
+      - run: sudo curl -Lo /usr/bin/rooster https://github.com/SheetJS/rooster/releases/download/v0.2.0/rooster-v0.2.0-linux-amd64
+      - run: sudo chmod a+x /usr/bin/rooster
+      - run: make init
+      - run: 'cd test_files; make all; cd -'
+      - run: npm run test
+      #- run: 'cd packages/ssf; npm run tests-only; cd -'
+
+  node:
+    name: 'io.js'
+    needs: [latest]
+    runs-on: ubuntu-latest
+    steps:
+      - run: 'echo tests completed'
diff --git a/.github/workflows/node-pretest.yml b/.github/workflows/node-pretest.yml
new file mode 100644
index 0000000..df59274
--- /dev/null
+++ b/.github/workflows/node-pretest.yml
@@ -0,0 +1,32 @@
+name: 'Tests: pretest/posttest'
+
+on: [pull_request, push]
+
+jobs:
+  pretest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ljharb/actions/node/install@main
+        name: 'nvm install lts/* && npm install'
+        with:
+          node-version: 'lts/*'
+      - run: sudo curl -Lo /usr/bin/rooster https://github.com/SheetJS/rooster/releases/download/v0.2.0/rooster-v0.2.0-linux-amd64
+      - run: sudo chmod a+x /usr/bin/rooster
+      - run: make init
+      - run: 'cd test_files; make all; cd -'
+      #- run: npm run pretest
+
+  # posttest:
+  #   runs-on: ubuntu-latest
+
+  #   steps:
+  #     - uses: actions/checkout@v2
+  #     - uses: ljharb/actions/node/install@main
+  #       name: 'nvm install lts/* && npm install'
+  #       with:
+  #         node-version: 'lts/*'
+  #     - run: make init
+  #     - run: 'cd test_files; make all; cd -'
+  #     - run: npm run posttest
diff --git a/.github/workflows/node-zero.yml b/.github/workflows/node-zero.yml
new file mode 100644
index 0000000..fd940ad
--- /dev/null
+++ b/.github/workflows/node-zero.yml
@@ -0,0 +1,88 @@
+name: 'Tests: node.js (0.x)'
+
+on: [pull_request, push]
+
+jobs:
+  matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      stable: ${{ steps.set-matrix.outputs.requireds }}
+#      unstable: ${{ steps.set-matrix.outputs.optionals }}
+    steps:
+      - uses: ljharb/actions/node/matrix@main
+        id: set-matrix
+        with:
+          versionsAsRoot: true
+          preset: '0.x'
+
+  stable:
+    needs: [matrix]
+    name: 'stable minors'
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: ${{ fromJson(needs.matrix.outputs.stable) }}
+        include:
+          - node-version: '0.12.'
+            env:
+              TZ: America/Cayman
+              FMTS: misc
+          - node-version: '0.10.'
+            env:
+              TZ: Pacific/Honolulu
+              FMTS: misc
+          - node-version: '0.8.'
+            env:
+              TZ: America/Mexico_City
+              FMTS: misc
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ljharb/actions/node/install@main
+        name: 'nvm install ${{ matrix.node-version }} && npm install'
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache-node-modules-key: node_modules-${{ github.workflow }}-${{ github.action }}-${{ github.run_id }}
+          skip-ls-check: true
+      - run: sudo curl -Lo /usr/bin/rooster https://github.com/SheetJS/rooster/releases/download/v0.2.0/rooster-v0.2.0-linux-amd64
+      - run: sudo chmod a+x /usr/bin/rooster
+      - run: make init
+      - run: 'cd test_files; make all; cd -'
+      - run: npm run test
+      #- run: 'cd packages/ssf; npm run tests-only; cd -'
+
+#  unstable:
+#    needs: [matrix, stable]
+#    name: 'unstable minors'
+#    continue-on-error: true
+#    if: ${{ !github.head_ref || !startsWith(github.head_ref, 'renovate') }}
+#    runs-on: ubuntu-latest
+
+#    strategy:
+#      fail-fast: false
+#      matrix:
+#        node-version: ${{ fromJson(needs.matrix.outputs.unstable) }}
+#
+#    steps:
+#      - uses: actions/checkout@v2
+#      - uses: ljharb/actions/node/install@main
+#        name: 'nvm install ${{ matrix.node-version }} && npm install'
+#        with:
+#          node-version: ${{ matrix.node-version }}
+#          cache-node-modules-key: node_modules-${{ github.workflow }}-${{ github.action }}-${{ github.run_id }}
+#          skip-ls-check: true
+#      - run: sudo curl -Lo /usr/bin/rooster https://github.com/SheetJS/rooster/releases/download/v0.2.0/rooster-v0.2.0-linux-amd64
+#      - run: sudo chmod a+x /usr/bin/rooster
+#      - run: make init
+#      - run: 'cd test_files; make all; cd -'
+#      - run: npm run tests-only
+
+  node:
+    name: 'node 0.x'
+#    needs: [stable, unstable]
+    needs: [stable]
+    runs-on: ubuntu-latest
+    steps:
+      - run: 'echo tests completed'