1 files changed, 99 insertions, 0 deletions
diff --git a/SchedulerDate.php b/SchedulerDate.php
new file mode 100644
index 0000000..52d342f
--- /dev/null
+++ b/SchedulerDate.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace Scheduler;
+use DateTime;
+
+interface ISchedulerDate
+{
+    static public function getDateTimestamp($date);
+}
+
+class SchedulerDate implements ISchedulerDate
+{
+    const SECONDS_IN_DAY = 86400;
+    const DAYS_IN_WEEK = 7;
+    const MONTHS_IN_YEAR = 12;
+
+    const FORMAT_DEFAULT = "Y-m-d H:i:s";
+
+    static $DATE_UNITS = array(
+        "hour" => "H",
+        "minute" => "i",
+        "second" => "s",
+        "month" => "m",
+        "day" => "d",
+        "year" => "Y"
+    );
+
+    static public function differenceBetweenDates($firstDateStamp, $secondDateStamp) {
+        $firstDate = new DateTime(date(self::FORMAT_DEFAULT, $firstDateStamp));
+        $secondDate = new DateTime(date(self::FORMAT_DEFAULT, $secondDateStamp));
+        $dateUnits = self::$DATE_UNITS;
+        $differenceArray = array();
+
+        foreach($dateUnits as $dateUnit)
+            $differenceArray[$dateUnit] = $firstDate->diff($secondDate, true)->format("%".$dateUnit);
+
+        return $differenceArray;
+    }
+
+    static public function getDateTimestamp($date)
+    {
+        $parsedDate = date_parse($date);
+        return mktime(
+            $parsedDate["hour"],
+            $parsedDate["minute"],
+            $parsedDate["second"],
+            $parsedDate["month"],
+            $parsedDate["day"],
+            $parsedDate["year"]
+        );
+    }
+
+    static public function getDayOfWeek($timestamp) {
+        $weekDay = getdate($timestamp)["wday"];
+        return $weekDay;
+    }
+
+    static public function addDate($timestamp, $unit, $count) {
+        $dateUnits = self::$DATE_UNITS;
+        $units = array(
+            $dateUnits["hour"],
+            $dateUnits["minute"],
+            $dateUnits["second"],
+            $dateUnits["month"],
+            $dateUnits["day"],
+            $dateUnits["year"]
+        );
+        $args = array();
+
+        for($i = 0; $i < count($units); $i++){
+            $time_part = $units[$i];
+            $param = date($time_part, $timestamp);
+            if($unit == $time_part)
+                $param += $count;
+
+            array_push($args, $param);
+
+        }
+
+        return call_user_func_array("mktime", $args);
+    }
+
+    static public function addDays($timestamp, $count) {
+        return self::addDate($timestamp, self::$DATE_UNITS["day"], $count);
+    }
+
+    static public function addWeeks($timestamp, $count) {
+        return self::addDate($timestamp, self::$DATE_UNITS["day"], ($count * self::DAYS_IN_WEEK));
+    }
+
+    static public function addMonths($timestamp, $count) {
+        return self::addDate($timestamp, self::$DATE_UNITS["month"], $count);
+    }
+
+    static public function addYears($timestamp, $count) {
+        return self::addDate($timestamp, self::$DATE_UNITS["year"], $count);
+    }
+
+}
+\ No newline at end of file