--- a/heuristics/dateHeuristics.php
+++ b/heuristics/dateHeuristics.php
@@ -1,1 +1,110 @@
+<?php
 
+//long contract period (number of weeks/days?)
+$heuristics["DATE_LONG_CONTRACT_PERIOD"] = Array(
+    "description" => "long contract period (number of weeks/days?)"
+);
+
+function DATE_LONG_CONTRACT_PERIOD($cn) {
+    $averageContractPeriod = getAverageContractPeriod();
+    $stddevContractPeriod = getstddevContractPeriod();
+    $diff = strtotime($cn['contractEnd']) - strtotime($cn['contractStart']);
+    $days = intval($diff / (60 * 60 * 24));
+    $value = abs($days - $averageContractPeriod) / $stddevContractPeriod;
+    return Array(
+        "heuristic_value" => $value,
+        "raw_value" => $days,
+        "mean" => $averageContractPeriod,
+        "stddev" => $stddevContractPeriod
+    );
+}
+
+$averageContractPeriod;
+
+function getAverageContractPeriod() {
+    global $averageContractPeriod, $stddevContractPeriod;
+    if (!$averageContractPeriod) {
+        getStddevAverageContractPeriod();
+    }
+    return $averageContractPeriod;
+}
+
+$stddevContractPeriod;
+
+function getstddevContractPeriod() {
+    global $averageContractPeriod, $stddevContractPeriod;
+    if (!$stddevContractPeriod) {
+        getStddevAverageContractPeriod();
+    }
+    return $stddevContractPeriod;
+}
+
+function getStddevAverageContractPeriod() {
+    global $averageContractPeriod, $stddevContractPeriod,$conn;
+    $query = 'select AVG("contractEnd"-"contractStart"),stddev("contractEnd"-"contractStart") from contractnotice';
+    $result = $conn->query($query);
+             databaseError($conn->errorInfo());
+    $r = $result->fetch(PDO::FETCH_BOTH);
+
+    $averageContractPeriod = $r[0];
+    $stddevContractPeriod = $r[1];
+}
+
+//Reported late, 45 days? A late contract is a dodgy contract except maybe for variations?
+$heuristics["DATE_REPORTED_LATE"] = Array(
+    "description" => "Reported late, 45 days?"
+);
+
+function DATE_REPORTED_LATE($cn) {
+    $averageDaysLate = getAverageDaysLate();
+    $stddevDaysLate = getStddevDaysLate();
+    $diff = strtotime($cn['publishDate']) - strtotime($cn['contractStart']);
+    $days = intval($diff / (60 * 60 * 24));
+    if ($days <= 0) {
+        $value = 0;
+    } else {
+        // +1 demerit for exceeding 45 day requirement
+        $value = (abs($days - $averageDaysLate) / $stddevDaysLate) + ($days < 45 ? 0 : 1);
+    }
+    return Array(
+        "heuristic_value" => $value,
+        "raw_value" => $days,
+        "mean" => $averageDaysLate,
+        "stddev" => $stddevDaysLate
+    );
+}
+
+$averageDaysLate;
+
+function getAverageDaysLate() {
+    global $averageDaysLate;
+    if (!$averageDaysLate) {
+        getDaysLate();
+    }
+    return $averageDaysLate;
+}
+
+$stddevDaysLate;
+
+function getStddevDaysLate() {
+    global $stddevDaysLate;
+    if (!$stddevDaysLate) {
+        getDaysLate();
+    }
+    return $stddevDaysLate;
+}
+
+function getDaysLate() {
+
+    global $averageDaysLate, $stddevDaysLate,$conn;
+
+    $query = 'select AVG(extract (day from "publishDate"-"contractStart")), STDDEV(extract (day from "publishDate"-"contractStart")) from contractnotice';
+    $result = $conn->query($query);
+          databaseError($conn->errorInfo());
+    $r = $result->fetch(PDO::FETCH_BOTH);
+
+    $averageDaysLate = $r[0];
+    $stddevDaysLate = $r[1];
+}
+
+?>