Setup jiffy date time

example/jiffy_example.dart

@@ -1,7 +1,5 @@
 import 'package:jiffy/jiffy.dart';
 
 main() async {
-
-  print(Jiffy("Changed", "Jama").minute);
-
+  print(Jiffy("Oct", "yyyy").year);
 }

lib/src/exception/exception.dart

@@ -0,0 +1,4 @@
+class JiffyException implements Exception {
+  final String cause;
+  JiffyException(this.cause);
+}

lib/src/jiffy.dart

@@ -1,12 +1,22 @@
 import 'package:intl/intl.dart';
+import 'package:jiffy/src/exception/exception.dart';
 
 class Jiffy {
   DateTime _dateTime = DateTime.now();
 
   DateTime get dateTime => _dateTime;
 
-
-  Jiffy([String time = "", String pattern = ""]);
+  Jiffy([String time, String pattern]) {
+    if (time == null && pattern == null) {
+      _dateTime = DateTime.now();
+    } else if (time != null && pattern == null) {
+      throw JiffyException(
+              "JiffyException: When passing time, a pattern must also be passed, e.g. Jiffy('12, Oct', 'dd, MMM')")
+          .cause;
+    } else {
+      _dateTime = DateFormat(pattern).parse(time);
+    }
+  }
 
   Jiffy.unit(num timestamp);
 
@@ -21,51 +31,54 @@ class Jiffy {
   int get week => ((dayOfYear - _dateTime.weekday + 10) / 7).floor();
   int get month => _dateTime.month;
   int get quarter => int.parse(DateFormat("Q").format(_dateTime));
-  int get year =>_dateTime.year;
-
-//  MANIPULATE
-  String add() {}
-
-  String subtract() {}
-
-  void startOf() {}
+  int get year => _dateTime.year;
 
-  void endOf() {}
+//  PARSE
+  void parse() {}
 
-  String local() {}
-
-  String utc() {}
+//  MANIPULATE
+//  String add() {}
+//
+//  String subtract() {}
+//
+//  void startOf() {}
+//
+//  void endOf() {}
+//
+//  String local() {}
+//
+//  String utc() {}
 
 //  DISPLAY
-  String format() {}
-
-  String fromNow() {}
-
-  String from(Jiffy jiffy) {}
-
-  int diff(Jiffy jiffy, [String unit]) {}
-
-  int valueOf() {}
-
-  int unix() {}
+//  String format() {}
+//
+//  String fromNow() {}
+//
+//  String from(Jiffy jiffy) {}
+//
+//  int diff(Jiffy jiffy, [String unit]) {}
+//
+//  int valueOf() {}
+//
+//  int unix() {}
 
 //  QUERY
-  bool isBefore(Jiffy jiffy) {}
-
-  bool isAfter(Jiffy jiffy) {}
-
-  bool isSame(Jiffy jiffy) {}
-
-  bool isSameOrBefore(Jiffy jiffy) {}
-
-  bool isSameOrAfter(Jiffy jiffy) {}
-
-  bool _isLeapYear() {}
-
-  bool get isLeapYear => _isLeapYear();
-
-  bool isJiffy(var input) {}
-
-  bool isDateTime(var input) {}
+//  bool isBefore(Jiffy jiffy) {}
+//
+//  bool isAfter(Jiffy jiffy) {}
+//
+//  bool isSame(Jiffy jiffy) {}
+//
+//  bool isSameOrBefore(Jiffy jiffy) {}
+//
+//  bool isSameOrAfter(Jiffy jiffy) {}
+//
+//  bool _isLeapYear() {}
+//
+//  bool get isLeapYear => _isLeapYear();
+//
+//  bool isJiffy(var input) {}
+//
+//  bool isDateTime(var input) {}
 
 }

test/jiffy_datetime_test.dart

@@ -0,0 +1,45 @@
+import 'package:jiffy/jiffy.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Test get datetime instance', () {
+    test("Pass without time and pattern", () {
+      expect(Jiffy().year, DateTime.now().year);
+      expect(Jiffy().month, DateTime.now().month);
+    });
+    test("Pass time and pattern", () {
+      expect(Jiffy("2009", "yyyy").year, 2009);
+      expect(Jiffy("Oct, 2009", "MMM, yyyy").year, 2009);
+    });
+    test("Pass time and with empty string pattern", () {
+      expect(Jiffy("2009", "").year, 1970);
+    });
+    test("Pass with empty time and pattern string", () {
+      expect(Jiffy("", "").year, 1970);
+    });
+    test("Pass pattern and with empty string time", () {
+      try {
+        Jiffy("", "yyyy");
+      } catch (e) {
+        expect(e.toString(),
+            "FormatException: Trying to read yyyy from  at position 0");
+      }
+    });
+    test("Pass time with wrong pattern", () {
+      try {
+        Jiffy("Oct", "yyyy");
+      } catch (e) {
+        expect(e.toString(),
+            "FormatException: Trying to read yyyy from Oct at position 0");
+      }
+    });
+    test("Pass time, with no pattern parameter", () {
+      try {
+        Jiffy("");
+      } catch (e) {
+        expect(e.toString(),
+            "JiffyException: When passing time, a pattern must also be passed, e.g. Jiffy('12, Oct', 'dd, MMM')");
+      }
+    });
+  });
+}