diff --git a/lib/contracts/contribution.js b/lib/contracts/contribution.js
index 780049d..6398458 100644
--- a/lib/contracts/contribution.js
+++ b/lib/contracts/contribution.js
@@ -1,5 +1,20 @@
 const ethers = require('ethers');
 
+const schemas = require('kosmos-schemas');
+const tv4 = require('tv4');
+const validator = tv4.freshApi();
+
+validator.addFormat({
+  'date': function(value) {
+    const dateRegexp = /^[0-9]{4,}-[0-9]{2}-[0-9]{2}$/;
+    return dateRegexp.test(value) ? null : "A valid ISO 8601 full-date string is expected";
+  },
+  'time': function(value) {
+    const timeRegexp = /^([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9]|60)(\.[0-9]+)?(([Zz])|([\+|\-]([01][0-9]|2[0-3]):[0-5][0-9]))$/;
+    return timeRegexp.test(value) ? null : "A valid ISO 8601 full-time string is expected";
+  }
+})
+
 const ContributionSerializer = require('../serializers/contribution');
 const Base = require('./base');
 
@@ -48,12 +63,15 @@ class Contribution extends Base {
   }
 
   addContribution(contributionAttr, callOptions = {}) {
-    let json = ContributionSerializer.serialize(contributionAttr);
-    // TODO: validate against schema
+    let jsonStr = ContributionSerializer.serialize(contributionAttr);
+
+    // Validate JSON document against schema
+    let result = validator.validate(JSON.parse(jsonStr), schemas['contribution']);
+    if (!result) { return Promise.reject(validator.error); }
 
     return this.ipfs
-      .add(json)
-      .then((ipfsHashAttr) => {
+      .add(jsonStr)
+      .then(ipfsHashAttr => {
         let contribution = [
           contributionAttr.amount,
           contributionAttr.contributorId,
diff --git a/lib/serializers/contribution.js b/lib/serializers/contribution.js
index 149b077..6cdc279 100644
--- a/lib/serializers/contribution.js
+++ b/lib/serializers/contribution.js
@@ -14,6 +14,8 @@ class Contribution {
   */
   static deserialize(serialized) {
     let {
+      date,
+      time,
       kind,
       description,
       details,
@@ -21,6 +23,8 @@ class Contribution {
     } = JSON.parse(serialized.toString('utf8'));
 
     return {
+      date,
+      time,
       kind,
       description,
       details,
@@ -38,6 +42,8 @@ class Contribution {
   static serialize(deserialized) {
     let {
       contributorIpfsHash,
+      date,
+      time,
       kind,
       description,
       url,
@@ -50,6 +56,8 @@ class Contribution {
       "contributor": {
         "ipfs": contributorIpfsHash
       },
+      date,
+      time,
       kind,
       description,
       "details": details || {}
diff --git a/package-lock.json b/package-lock.json
index b01b9ae..50446de 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -833,14 +833,12 @@
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
     },
     "ansi-styles": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
     },
     "any-observable": {
       "version": "0.2.0",
@@ -951,7 +949,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
-      "dev": true,
       "requires": {
         "chalk": "^1.1.3",
         "esutils": "^2.0.2",
@@ -962,7 +959,6 @@
           "version": "1.1.3",
           "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "dev": true,
           "requires": {
             "ansi-styles": "^2.2.1",
             "escape-string-regexp": "^1.0.2",
@@ -977,7 +973,6 @@
       "version": "6.26.3",
       "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.3.tgz",
       "integrity": "sha512-6jyFLuDmeidKmUEb3NM+/yawG0M2bDZ9Z1qbZP59cyHLz8kYGKYwpJP0UwUKKUiTRNvxfLesJnTedqczP7cTDA==",
-      "dev": true,
       "requires": {
         "babel-code-frame": "^6.26.0",
         "babel-generator": "^6.26.0",
@@ -1004,7 +999,6 @@
       "version": "6.26.1",
       "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.1.tgz",
       "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
-      "dev": true,
       "requires": {
         "babel-messages": "^6.23.0",
         "babel-runtime": "^6.26.0",
@@ -1019,8 +1013,7 @@
         "jsesc": {
           "version": "1.3.0",
           "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-1.3.0.tgz",
-          "integrity": "sha1-RsP+yMGJKxKwgz25vHYiF226s0s=",
-          "dev": true
+          "integrity": "sha1-RsP+yMGJKxKwgz25vHYiF226s0s="
         }
       }
     },
@@ -1155,7 +1148,6 @@
       "version": "6.24.1",
       "resolved": "https://registry.npmjs.org/babel-helpers/-/babel-helpers-6.24.1.tgz",
       "integrity": "sha1-NHHenK7DiOXIUOWX5Yom3fN2ArI=",
-      "dev": true,
       "requires": {
         "babel-runtime": "^6.22.0",
         "babel-template": "^6.24.1"
@@ -1165,7 +1157,6 @@
       "version": "6.23.0",
       "resolved": "https://registry.npmjs.org/babel-messages/-/babel-messages-6.23.0.tgz",
       "integrity": "sha1-8830cDhYA1sqKVHG7F7fbGLyYw4=",
-      "dev": true,
       "requires": {
         "babel-runtime": "^6.22.0"
       }
@@ -1179,6 +1170,23 @@
         "babel-runtime": "^6.22.0"
       }
     },
+    "babel-plugin-static-fs": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-static-fs/-/babel-plugin-static-fs-1.2.0.tgz",
+      "integrity": "sha512-7zsDPvDzCBwfbU53WKym5LxTe1PxQHE/dGo+EfIELlBcn08TpU7SlPJILcc6YVAyTrpVUNioQfWiUyMWk1DJVg==",
+      "requires": {
+        "babel-template": "^6.3.13",
+        "babel-types": "^6.4.1",
+        "events": "^1.1.0"
+      },
+      "dependencies": {
+        "events": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/events/-/events-1.1.1.tgz",
+          "integrity": "sha1-nr23Y1rQmccNzEwqH1AEKI6L2SQ="
+        }
+      }
+    },
     "babel-plugin-syntax-async-functions": {
       "version": "6.13.0",
       "resolved": "https://registry.npmjs.org/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz",
@@ -1514,7 +1522,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-register/-/babel-register-6.26.0.tgz",
       "integrity": "sha1-btAhFz4vy0htestFxgCahW9kcHE=",
-      "dev": true,
       "requires": {
         "babel-core": "^6.26.0",
         "babel-runtime": "^6.26.0",
@@ -1529,7 +1536,6 @@
           "version": "0.4.18",
           "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.4.18.tgz",
           "integrity": "sha512-try0/JqxPLF9nOjvSta7tVondkP5dwgyLDjVoyMDlmjugT2lRZ1OfsrYTkCd2hkDnJTKRbO/Rl3orm8vlsUzbA==",
-          "dev": true,
           "requires": {
             "source-map": "^0.5.6"
           }
@@ -1540,7 +1546,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
       "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
-      "dev": true,
       "requires": {
         "core-js": "^2.4.0",
         "regenerator-runtime": "^0.11.0"
@@ -1550,7 +1555,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.26.0.tgz",
       "integrity": "sha1-3gPi0WOWsGn0bdn/+FIfsaDjXgI=",
-      "dev": true,
       "requires": {
         "babel-runtime": "^6.26.0",
         "babel-traverse": "^6.26.0",
@@ -1563,7 +1567,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.26.0.tgz",
       "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
-      "dev": true,
       "requires": {
         "babel-code-frame": "^6.26.0",
         "babel-messages": "^6.23.0",
@@ -1580,7 +1583,6 @@
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
       "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
-      "dev": true,
       "requires": {
         "babel-runtime": "^6.26.0",
         "esutils": "^2.0.2",
@@ -1609,8 +1611,7 @@
     "babylon": {
       "version": "6.18.0",
       "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
-      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
-      "dev": true
+      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ=="
     },
     "balanced-match": {
       "version": "1.0.0",
@@ -1802,6 +1803,16 @@
         "concat-map": "0.0.1"
       }
     },
+    "brfs-babel": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/brfs-babel/-/brfs-babel-1.0.0.tgz",
+      "integrity": "sha1-Zy32AGfQKSEMSTKNeLOXnVe1Cxg=",
+      "requires": {
+        "babel-core": "^6.4.0",
+        "babel-plugin-static-fs": "^1.1.0",
+        "through2": "^2.0.0"
+      }
+    },
     "brorand": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
@@ -2287,7 +2298,6 @@
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.6.0.tgz",
       "integrity": "sha512-eFu7XigvxdZ1ETfbgPBohgyQ/Z++C0eEhTor0qRwBw9unw+L0/6V8wkSuGgzdThkiS5lSpdptOQPD8Ak40a+7A==",
-      "dev": true,
       "requires": {
         "safe-buffer": "~5.1.1"
       }
@@ -2313,14 +2323,12 @@
     "core-js": {
       "version": "2.6.5",
       "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.5.tgz",
-      "integrity": "sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A==",
-      "dev": true
+      "integrity": "sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A=="
     },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-      "dev": true
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
     "cors": {
       "version": "2.8.5",
@@ -2432,7 +2440,6 @@
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
       "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-      "dev": true,
       "requires": {
         "ms": "2.0.0"
       }
@@ -2628,7 +2635,6 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-4.0.0.tgz",
       "integrity": "sha1-920GQ1LN9Docts5hnE7jqUdd4gg=",
-      "dev": true,
       "requires": {
         "repeating": "^2.0.0"
       }
@@ -2831,14 +2837,12 @@
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
-      "dev": true
+      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
     "esutils": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
-      "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=",
-      "dev": true
+      "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs="
     },
     "etag": {
       "version": "1.8.1",
@@ -9899,8 +9903,7 @@
     "globals": {
       "version": "9.18.0",
       "resolved": "https://registry.npmjs.org/globals/-/globals-9.18.0.tgz",
-      "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ==",
-      "dev": true
+      "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ=="
     },
     "go-ipfs": {
       "version": "0.4.17",
@@ -10018,7 +10021,6 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/has-ansi/-/has-ansi-2.0.0.tgz",
       "integrity": "sha1-NPUEnOHs3ysGSa8+8k5F7TVBbZE=",
-      "dev": true,
       "requires": {
         "ansi-regex": "^2.0.0"
       }
@@ -10100,7 +10102,6 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/home-or-tmp/-/home-or-tmp-2.0.0.tgz",
       "integrity": "sha1-42w/LSyufXRqhX440Y1fMqeILbg=",
-      "dev": true,
       "requires": {
         "os-homedir": "^1.0.0",
         "os-tmpdir": "^1.0.1"
@@ -10322,7 +10323,6 @@
       "version": "2.2.4",
       "resolved": "https://registry.npmjs.org/invariant/-/invariant-2.2.4.tgz",
       "integrity": "sha512-phJfQVBuaJM5raOpJjSfkiD6BpbCE4Ns//LaXl6wGYtUBY83nWS6Rf9tXm2e8VaK60JEjYldbPif/A2B1C2gNA==",
-      "dev": true,
       "requires": {
         "loose-envify": "^1.0.0"
       }
@@ -10770,7 +10770,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-finite/-/is-finite-1.0.2.tgz",
       "integrity": "sha1-zGZ3aVYCvlUO8R6LSqYwU0K20Ko=",
-      "dev": true,
       "requires": {
         "number-is-nan": "^1.0.0"
       }
@@ -10934,8 +10933,7 @@
     "isarray": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
-      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-      "dev": true
+      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
     },
     "isexe": {
       "version": "2.0.0",
@@ -11021,8 +11019,7 @@
     "js-tokens": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.2.tgz",
-      "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
-      "dev": true
+      "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls="
     },
     "jsbn": {
       "version": "0.1.1",
@@ -11102,8 +11099,7 @@
     "json5": {
       "version": "0.5.1",
       "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
-      "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
-      "dev": true
+      "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE="
     },
     "jsonfile": {
       "version": "2.4.0",
@@ -11178,6 +11174,13 @@
         "graceful-fs": "^4.1.9"
       }
     },
+    "kosmos-schemas": {
+      "version": "github:67P/kosmos-schemas#28a5e9f1fc2e083165e4e02ce3361c3f4fafa592",
+      "from": "github:67P/kosmos-schemas#feature/contribution_date_time",
+      "requires": {
+        "brfs-babel": "^1.0.0"
+      }
+    },
     "lcid": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
@@ -11718,7 +11721,6 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
       "integrity": "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q==",
-      "dev": true,
       "requires": {
         "js-tokens": "^3.0.0 || ^4.0.0"
       }
@@ -12026,7 +12028,6 @@
       "version": "0.5.1",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
-      "dev": true,
       "requires": {
         "minimist": "0.0.8"
       },
@@ -12034,8 +12035,7 @@
         "minimist": {
           "version": "0.0.8",
           "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
-          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
-          "dev": true
+          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
         }
       }
     },
@@ -12127,8 +12127,7 @@
     "ms": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
-      "dev": true
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
     },
     "multiaddr": {
       "version": "3.1.0",
@@ -12322,8 +12321,7 @@
     "number-is-nan": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
-      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
-      "dev": true
+      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
     },
     "number-to-bn": {
       "version": "1.7.0",
@@ -12463,8 +12461,7 @@
     "os-homedir": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
-      "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
-      "dev": true
+      "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M="
     },
     "os-locale": {
       "version": "1.4.0",
@@ -12478,8 +12475,7 @@
     "os-tmpdir": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
-      "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
-      "dev": true
+      "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ="
     },
     "over": {
       "version": "0.0.5",
@@ -12775,8 +12771,7 @@
     "private": {
       "version": "0.1.8",
       "resolved": "https://registry.npmjs.org/private/-/private-0.1.8.tgz",
-      "integrity": "sha512-VvivMrbvd2nKkiG38qjULzlc+4Vx4wm/whI9pQD35YrARNnhxeiRktSOhSukRLFNlzg6Br/cJPet5J/u19r/mg==",
-      "dev": true
+      "integrity": "sha512-VvivMrbvd2nKkiG38qjULzlc+4Vx4wm/whI9pQD35YrARNnhxeiRktSOhSukRLFNlzg6Br/cJPet5J/u19r/mg=="
     },
     "process": {
       "version": "0.5.2",
@@ -12787,8 +12782,7 @@
     "process-nextick-args": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
-      "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
-      "dev": true
+      "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw=="
     },
     "promise": {
       "version": "1.3.0",
@@ -13158,7 +13152,6 @@
       "version": "2.3.6",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
       "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
-      "dev": true,
       "requires": {
         "core-util-is": "~1.0.0",
         "inherits": "~2.0.3",
@@ -13178,8 +13171,7 @@
     "regenerator-runtime": {
       "version": "0.11.1",
       "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz",
-      "integrity": "sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg==",
-      "dev": true
+      "integrity": "sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg=="
     },
     "regenerator-transform": {
       "version": "0.10.1",
@@ -13222,7 +13214,6 @@
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/repeating/-/repeating-2.0.1.tgz",
       "integrity": "sha1-UhTFOpJtNVJwdSf7q0FdvAjQbdo=",
-      "dev": true,
       "requires": {
         "is-finite": "^1.0.0"
       }
@@ -13663,8 +13654,7 @@
     "slash": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-1.0.0.tgz",
-      "integrity": "sha1-xB8vbDn8FtHNF61LXYlhFK5HDVU=",
-      "dev": true
+      "integrity": "sha1-xB8vbDn8FtHNF61LXYlhFK5HDVU="
     },
     "slice-ansi": {
       "version": "0.0.4",
@@ -13766,8 +13756,7 @@
     "source-map": {
       "version": "0.5.7",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-      "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-      "dev": true
+      "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w="
     },
     "source-map-support": {
       "version": "0.5.11",
@@ -13962,7 +13951,6 @@
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-      "dev": true,
       "requires": {
         "ansi-regex": "^2.0.0"
       }
@@ -14003,8 +13991,7 @@
     "supports-color": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-      "dev": true
+      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc="
     },
     "swarm-js": {
       "version": "0.1.37",
@@ -14177,7 +14164,6 @@
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
       "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
-      "dev": true,
       "requires": {
         "readable-stream": "~2.3.6",
         "xtend": "~4.0.1"
@@ -14223,8 +14209,7 @@
     "to-fast-properties": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
-      "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
-      "dev": true
+      "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc="
     },
     "tough-cookie": {
       "version": "2.4.3",
@@ -14253,8 +14238,7 @@
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
-      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
-      "dev": true
+      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM="
     },
     "truffle": {
       "version": "4.1.14",
@@ -14450,6 +14434,11 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "tv4": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/tv4/-/tv4-1.3.0.tgz",
+      "integrity": "sha1-0CDIRvrdUMhVq7JeuuzGj8EPeWM="
+    },
     "tweetnacl": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-1.0.1.tgz",
@@ -15603,8 +15592,7 @@
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
-      "dev": true
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
     },
     "y18n": {
       "version": "3.2.1",
diff --git a/package.json b/package.json
index d285749..a57481c 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,9 @@
   "dependencies": {
     "ethers": "^4.0.27",
     "ipfs-http-client": "^30.1.1",
-    "rsvp": "^4.8.2"
+    "kosmos-schemas": "github:67P/kosmos-schemas#feature/contribution_date_time",
+    "rsvp": "^4.8.2",
+    "tv4": "^1.3.0"
   },
   "keywords": [
     "kosmos",
diff --git a/scripts/add-contribution.js b/scripts/add-contribution.js
index 7b1e448..78b1b03 100644
--- a/scripts/add-contribution.js
+++ b/scripts/add-contribution.js
@@ -1,4 +1,5 @@
 const promptly = require('promptly');
+const { inspect } = require('util');
 
 const initKredits = require('./helpers/init_kredits.js');
 
@@ -26,23 +27,32 @@ module.exports = async function(callback) {
 
   console.log(`Creating a contribution for contributor account ${contributorAccount} ID: ${contributorId}`);
 
+  [ dateNow, timeNow ] = (new Date()).toISOString().split('T');
+
   let contributionAttributes = {
     contributorId,
+    date: dateNow,
+    time: timeNow,
     amount: await promptly.prompt('Amount: '),
     description: await promptly.prompt('Description: '),
     kind: await promptly.prompt('Kind: ', { default: 'dev' }),
     url: await promptly.prompt('URL: ', { default: '' })
   }
 
+  const contributorData = await kredits.Contributor.getById(contributorId);
+  contributionAttributes.contributorIpfsHash = contributorData.ipfsHash;
+
   console.log("\nAdding contribution:");
   console.log(contributionAttributes);
 
-  kredits.Contribution.addContribution(contributionAttributes, { gasLimit: 300000 }).then((result) => {
-    console.log("\n\nResult:");
-    console.log(result);
-    callback();
-  }).catch((error) => {
-    console.log('Failed to create contribution');
-    callback(error);
-  });
+  kredits.Contribution.addContribution(contributionAttributes, { gasLimit: 300000 })
+    .then(result => {
+      console.log("\n\nResult:");
+      console.log(result);
+      callback();
+    })
+    .catch(error => {
+      console.log('Failed to create contribution');
+      callback(inspect(error));
+    });
 }