diff --git a/README.md b/README.md
index 0163060..5922a4e 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,14 @@ HTML inputs are favoring HTML5 ones instead of fancy jquery-like plugins to redu
 
 Other requirements are on the `requirements.txt` file. Install them with `pip` or similar.
 
+## Data Migrations
+
+Starting with version `v1.0`, there is a `\scripts` folder that will contain any required migrations. They will be listed here in this section to simplify things.
+
+### Migrations
+
+- `data_migration_001`: **`v0.9` -> `v1.0`**. Not backwards compatible once migrated. Must be run before `v1.0` logic or server will throw errors and maybe could override old `due_time` fields.
+
 ## Docker Environment
 
 - Development strongly encourages using Docker and Docker Compose.
diff --git a/data/sample.json b/data/sample.json
index 1f68a9f..c95ec6b 100644
--- a/data/sample.json
+++ b/data/sample.json
@@ -9,7 +9,7 @@
               "title": "Task title",
               "id": 0,
               "color": "#039BE5",
-              "due_time": "00:00",
+              "start_time": "00:00","end_time": "00:00",
               "is_all_day": true
             },
             {
@@ -17,7 +17,7 @@
               "title": "Task #2",
               "id": 1,
               "color": "#EF6C00",
-              "due_time": "15:30",
+              "start_time": "15:30","end_time": "15:30",
               "is_all_day": false
             }
           ]
@@ -32,7 +32,7 @@
         "title": "Repetitive weekly weekday",
         "id": 0,
         "color": "#B19CDA",
-        "due_time": "00:00",
+        "start_time": "00:00","end_time": "00:00",
         "repetition_subtype": "w",
         "is_all_day": true
       },
@@ -43,7 +43,7 @@
         "title": "Repetitive monthly weekday",
         "id": 1,
         "color": "#53A93F",
-        "due_time": "00:00",
+        "start_time": "00:00","end_time": "00:00",
         "repetition_subtype": "w",
         "is_all_day": true
       },
@@ -54,7 +54,7 @@
         "title": "Repetitive monthly monthday",
         "id": 2,
         "color": "#777777",
-        "due_time": "00:00",
+        "start_time": "00:00","end_time": "00:00",
         "repetition_subtype": "m",
         "is_all_day": true
       },
@@ -65,7 +65,7 @@
         "title": "Repetitive weekly weekday",
         "id": 3,
         "color": "#785649",
-        "due_time": "19:30",
+        "start_time": "19:30","end_time": "19:30",
         "repetition_subtype": "w",
         "is_all_day": false
       }
diff --git a/data/sample2.json b/data/sample2.json
index 6c590b3..7b4b7aa 100644
--- a/data/sample2.json
+++ b/data/sample2.json
@@ -5,7 +5,7 @@
         "repetition_value": 0,
         "details": "every monday (all day task)",
         "title": "Repetitive weekly weekday",
-        "due_time": "00:00",
+        "start_time": "00:00","end_time": "00:00",
         "color": "#B19CDA",
         "repetition_subtype": "w",
         "is_all_day": true,
@@ -16,7 +16,7 @@
         "repetition_value": 5,
         "details": "1st saturday of the month",
         "title": "Repetitive monthly weekday",
-        "due_time": "00:00",
+        "start_time": "00:00","end_time": "00:00",
         "color": "#53A93F",
         "repetition_subtype": "w",
         "is_all_day": true,
@@ -27,7 +27,7 @@
         "repetition_value": 1,
         "details": "1st day of the month",
         "title": "Repetitive monthly monthday",
-        "due_time": "00:00",
+        "start_time": "00:00","end_time": "00:00",
         "color": "#777777",
         "repetition_subtype": "m",
         "is_all_day": true,
@@ -38,7 +38,7 @@
         "repetition_value": 3,
         "details": "every thursday at afternoon",
         "title": "Repetitive weekly weekday",
-        "due_time": "19:30",
+        "start_time": "19:30","end_time": "19:30",
         "color": "#785649",
         "repetition_subtype": "w",
         "is_all_day": false,
@@ -55,7 +55,7 @@
               "color": "#53A93F",
               "details": " ",
               "title": "test 2222",
-              "due_time": "00:00",
+              "start_time": "00:00","end_time": "00:00",
               "id": 1517683764,
               "is_all_day": true
             }
@@ -69,7 +69,7 @@
               "color": "#039BE5",
               "details": "Task details",
               "title": "Task title",
-              "due_time": "00:00",
+              "start_time": "00:00","end_time": "00:00",
               "is_all_day": true,
               "id": 0
             },
@@ -77,7 +77,7 @@
               "color": "#EF6C00",
               "details": "Task 2 details",
               "title": "Task #2",
-              "due_time": "15:30",
+              "start_time": "15:30","end_time": "15:30",
               "is_all_day": false,
               "id": 1
             }
diff --git a/flask_calendar/actions.py b/flask_calendar/actions.py
index e897c34..c005047 100644
--- a/flask_calendar/actions.py
+++ b/flask_calendar/actions.py
@@ -237,7 +237,8 @@ def update_task_action(calendar_id: str, year: str, month: str, day: str, task_i
     else:
         updated_year = updated_month = updated_day = None
     is_all_day = request.form.get("is_all_day", "0") == "1"
-    due_time = request.form["due_time"]
+    start_time = request.form["start_time"]
+    end_time = request.form.get("end_time", None)
     details = request.form["details"].replace("\r", "").replace("\n", "<br>")
     color = request.form["color"]
     has_repetition = request.form.get("repeats", "0") == "1"
@@ -252,7 +253,8 @@ def update_task_action(calendar_id: str, year: str, month: str, day: str, task_i
         day=updated_day,
         title=title,
         is_all_day=is_all_day,
-        due_time=due_time,
+        start_time=start_time,
+        end_time=end_time,
         details=details,
         color=color,
         has_repetition=has_repetition,
@@ -287,7 +289,8 @@ def save_task_action(calendar_id: str) -> Response:
     else:
         year = month = day = None
     is_all_day = request.form.get("is_all_day", "0") == "1"
-    due_time = request.form["due_time"]
+    start_time = request.form["start_time"]
+    end_time = request.form.get("end_time", None)
     details = request.form["details"].replace("\r", "").replace("\n", "<br>")
     color = request.form["color"]
     has_repetition = request.form.get("repeats", "0") == "1"
@@ -303,7 +306,8 @@ def save_task_action(calendar_id: str) -> Response:
         day=day,
         title=title,
         is_all_day=is_all_day,
-        due_time=due_time,
+        start_time=start_time,
+        end_time=end_time,
         details=details,
         color=color,
         has_repetition=has_repetition,
diff --git a/flask_calendar/calendar_data.py b/flask_calendar/calendar_data.py
index 5616dd0..6a33ee5 100644
--- a/flask_calendar/calendar_data.py
+++ b/flask_calendar/calendar_data.py
@@ -200,13 +200,14 @@ def create_task(
         day: Optional[int],
         title: str,
         is_all_day: bool,
-        due_time: str,
+        start_time: str,
         details: str,
         color: str,
         has_repetition: bool,
         repetition_type: Optional[str],
         repetition_subtype: Optional[str],
         repetition_value: int,
+        end_time: Optional[str] = None,
     ) -> bool:
         details = details if len(details) > 0 else "&nbsp;"
         data = self.load_calendar(calendar_id)
@@ -214,7 +215,8 @@ def create_task(
         new_task = {
             "id": int(time.time()),
             "color": color,
-            "due_time": due_time,
+            "start_time": start_time,
+            "end_time": end_time if end_time else start_time,
             "is_all_day": is_all_day,
             "title": title,
             "details": details,
diff --git a/flask_calendar/scripts/data_migration_001.sh b/flask_calendar/scripts/data_migration_001.sh
new file mode 100755
index 0000000..5ef8b40
--- /dev/null
+++ b/flask_calendar/scripts/data_migration_001.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [[ $# -eq 0 ]] ; then
+    echo 'Must pass as an argument the data folder'
+    exit 0
+fi
+DATA_FOLDER=$1
+
+find $DATA_FOLDER -name '*.json' -type f -exec sed -i 's/"due_time":\(\s\?"[0-9]\{1,2\}:[0-9]\{1,2\}"\)/"start_time":\1,"end_time":\1/g' {} \;
+
+echo 'Migration of json data complete. Data files are not backwards compatible with versions previous to v1.0.'
diff --git a/flask_calendar/static/style.css b/flask_calendar/static/style.css
index 1272d61..868cdc9 100644
--- a/flask_calendar/static/style.css
+++ b/flask_calendar/static/style.css
@@ -168,6 +168,10 @@ li {
   cursor: auto;
 }
 
+span.time {
+    font-size: 9px;
+}
+
 span.daynumber {
     font-size: 13.5px;
     font-weight: 400;
diff --git a/flask_calendar/templates/calendar.html b/flask_calendar/templates/calendar.html
index 0ad2662..37ca55c 100644
--- a/flask_calendar/templates/calendar.html
+++ b/flask_calendar/templates/calendar.html
@@ -57,7 +57,7 @@
                 {{ day.day }}</span>
                 <ul class="tasks">
                     {% if day.month|string in tasks and day.day|string in tasks[day.month|string] %}
-                        {% for task in tasks[day.month|string][day.day|string]|sort(attribute="due_time") %}
+                        {% for task in tasks[day.month|string][day.day|string]|sort(attribute="start_time") %}
                             <li
                                 {% if day.month != month %}
                                     class="task greyed"
@@ -72,7 +72,7 @@
                                 {% if "repetition_type" in task %}data-recurrent="1"{% endif %}>
 
                                 {% if not task["is_all_day"] %}
-                                    {{ task["due_time"] }}
+                                    <span class="time">{{ task["start_time"] }}{% if task["start_time"] != task["end_time"] %} - {{ task["end_time"] }}{% endif %}</span>
                                 {% endif %}
                                 {{ task["title"] }}
                                 <p class="accordion-hidden">
@@ -324,7 +324,8 @@
                 return;
             }
             if (eventData.target.nodeName === "LI" && eventData.target.className === "task") {
-                ToggleDetails(eventData.target.children[0]);
+                // If is not "all day" there will be a span containing the time before the content
+                ToggleDetails(eventData.target.children[eventData.target.children.length - 1]);
                 return;
             }
             if (eventData.target.nodeName === "P" && (eventData.target.className === "accordion-hidden" ||
diff --git a/flask_calendar/templates/task.html b/flask_calendar/templates/task.html
index 285ca24..c187fcf 100644
--- a/flask_calendar/templates/task.html
+++ b/flask_calendar/templates/task.html
@@ -41,13 +41,16 @@
              />
         <br/>
 
-        <div id="due_time_block"
+        <div id="start_time_block"
             {% if task["is_all_day"] %}
                 class="hidden"
             {% endif %}
              >
-            <label for="due_time">Due time</label>
-            <input type="time" id="due_time" name="due_time" value="{{ task.get("due_time", "00:00") }}" />
+            <label for="start_time">Start time</label>
+            <input type="time" id="start_time" name="start_time" value="{{ task.get("start_time", "00:00") }}" />
+            <br/>
+            <label for="end_time">End time</label>
+            <input type="time" id="end_time" name="end_time" value="{{ task.get("end_time", "00:00") }}" />
             <br/>
         </div>
 
@@ -227,13 +230,18 @@
     window.onload = function() {
         document.getElementById("is_all_day").onclick = function(eventData) {
             if (eventData.target.checked === true) {
-                document.getElementById("due_time_block").className = "hidden";
-                document.getElementById("due_time").value ="00:00";
+                document.getElementById("start_time_block").className = "hidden";
+                document.getElementById("start_time").value ="00:00";
+                document.getElementById("end_time").value ="00:00";
             } else {
-                document.getElementById("due_time_block").className = "";
+                document.getElementById("start_time_block").className = "";
             }
         };
 
+        document.getElementById("start_time").onchange = function(eventData) {
+            document.getElementById("end_time").value = eventData.target.value;
+        }
+
         document.getElementById("repeats").onclick = function(eventData) {
             if (eventData.target.checked === true) {
                 document.getElementById("type_weekly").checked = true;
diff --git a/test/fixtures/past_normal_tasks.json b/test/fixtures/past_normal_tasks.json
index 341f5e8..b92b6cd 100644
--- a/test/fixtures/past_normal_tasks.json
+++ b/test/fixtures/past_normal_tasks.json
@@ -13,7 +13,8 @@
               "title": "A task",
               "details": "Task details",
               "id": 1,
-              "due_time": "00:00",
+              "start_time": "00:00",
+              "end_time": "00:00",
               "color": "#000"
             }
           ]
@@ -25,7 +26,8 @@
               "title": "Another task",
               "details": "Task details",
               "id": 2,
-              "due_time": "15:30",
+              "start_time": "15:30",
+              "end_time": "16:00",
               "color": "#EF6C00"
             }
           ]
diff --git a/test/fixtures/repetitive_monthly_monthday_hidden_task_data_file.json b/test/fixtures/repetitive_monthly_monthday_hidden_task_data_file.json
index 6ea19ca..9b974dc 100644
--- a/test/fixtures/repetitive_monthly_monthday_hidden_task_data_file.json
+++ b/test/fixtures/repetitive_monthly_monthday_hidden_task_data_file.json
@@ -8,7 +8,8 @@
         "title": "Repetitive monthly monthday",
         "details": "1st day of the month",
         "id": 2,
-        "due_time": "00:00",
+        "start_time": "00:00",
+        "end_time": "00:00",
         "repetition_value": 1,
         "repetition_subtype": "m",
         "repetition_type": "m",
diff --git a/test/fixtures/repetitive_monthly_weekday_hidden_task_data_file.json b/test/fixtures/repetitive_monthly_weekday_hidden_task_data_file.json
index a245d71..041fed9 100644
--- a/test/fixtures/repetitive_monthly_weekday_hidden_task_data_file.json
+++ b/test/fixtures/repetitive_monthly_weekday_hidden_task_data_file.json
@@ -8,7 +8,8 @@
         "title": "Repetitive monthly weekday",
         "details": "1st saturday of the month",
         "id": 1,
-        "due_time": "00:00",
+        "start_time": "00:00",
+        "end_time": "00:00",
         "repetition_value": 5,
         "repetition_subtype": "w",
         "repetition_type": "m",
diff --git a/test/fixtures/sample_data_file.json b/test/fixtures/sample_data_file.json
index 4f230e4..1a39e7f 100644
--- a/test/fixtures/sample_data_file.json
+++ b/test/fixtures/sample_data_file.json
@@ -8,7 +8,8 @@
         "title": "Repetitive weekly weekday",
         "details": "every monday (all day task)",
         "id": 0,
-        "due_time": "00:00",
+        "start_time": "00:00",
+        "end_time": "00:00",
         "repetition_value": 0,
         "repetition_subtype": "w",
         "repetition_type": "w",
@@ -19,7 +20,8 @@
         "title": "Repetitive monthly weekday",
         "details": "1st saturday of the month",
         "id": 1,
-        "due_time": "00:00",
+        "start_time": "00:00",
+        "end_time": "00:00",
         "repetition_value": 5,
         "repetition_subtype": "w",
         "repetition_type": "m",
@@ -30,7 +32,8 @@
         "title": "Repetitive monthly monthday",
         "details": "1st day of the month",
         "id": 2,
-        "due_time": "00:00",
+        "start_time": "00:00",
+        "end_time": "00:00",
         "repetition_value": 1,
         "repetition_subtype": "m",
         "repetition_type": "m",
@@ -41,7 +44,8 @@
         "title": "Repetitive weekly weekday",
         "details": "every thursday at afternoon",
         "id": 3,
-        "due_time": "19:30",
+        "start_time": "19:30",
+        "end_time": "00:00",
         "repetition_value": 3,
         "repetition_subtype": "w",
         "repetition_type": "w",
@@ -57,7 +61,8 @@
               "title": "Month 11 task",
               "details": "Task details",
               "id": 4,
-              "due_time": "00:00",
+              "start_time": "00:00",
+              "end_time": "00:00",
               "color": "#000"
             }
           ]
@@ -69,7 +74,8 @@
               "title": "Task title",
               "details": "Task details",
               "id": 0,
-              "due_time": "00:00",
+              "start_time": "00:00",
+              "end_time": "00:00",
               "color": "#039BE5"
             },
             {
@@ -77,7 +83,8 @@
               "title": "Task #2",
               "details": "Task 2 details",
               "id": 1,
-              "due_time": "15:30",
+              "start_time": "15:30",
+              "end_time": "15:30",
               "color": "#EF6C00"
             }
           ]
diff --git a/test/test_calendar_data.py b/test/test_calendar_data.py
index 31cc044..61bdac2 100644
--- a/test/test_calendar_data.py
+++ b/test/test_calendar_data.py
@@ -109,7 +109,7 @@ def test_creates_new_normal_task(save_calendar_mock: MagicMock, calendar_data: C
     day = 10
     title = "an irrelevant title"
     is_all_day = True
-    due_time = "00:00"
+    start_time = "00:00"
     details = ""
     color = "an_irrelevant_color"
     has_repetition = False
@@ -125,7 +125,7 @@ def test_creates_new_normal_task(save_calendar_mock: MagicMock, calendar_data: C
         day=day,
         title=title,
         is_all_day=is_all_day,
-        due_time=due_time,
+        start_time=start_time,
         details=details,
         color=color,
         has_repetition=has_repetition,
@@ -148,6 +148,60 @@ def test_creates_new_normal_task(save_calendar_mock: MagicMock, calendar_data: C
     assert data["tasks"]["normal"][str(year)][str(month)][str(day)][0]["title"] == title
 
 
+@patch("flask_calendar.calendar_data.CalendarData._save_calendar")
+def test_creates_task_with_start_and_end_dates(save_calendar_mock: MagicMock, calendar_data: CalendarData) -> None:
+    year = 2017
+    month = 12
+    day = 10
+    title = "an irrelevant title"
+    is_all_day = False
+    start_time = "12:00"
+    end_time = "13:00"
+    details = ""
+    color = "an_irrelevant_color"
+    has_repetition = False
+    repetition_type = ""
+    repetition_subtype = ""
+    repetition_value = 0
+    calendar_id = "sample_empty_data_file"
+
+    result = calendar_data.create_task(
+        calendar_id=calendar_id,
+        year=year,
+        month=month,
+        day=day,
+        title=title,
+        is_all_day=is_all_day,
+        start_time=start_time,
+        end_time=end_time,
+        details=details,
+        color=color,
+        has_repetition=has_repetition,
+        repetition_type=repetition_type,
+        repetition_subtype=repetition_subtype,
+        repetition_value=repetition_value,
+    )
+    assert result is True
+
+    save_calendar_mock.assert_called_once_with(ANY, filename=calendar_id)
+    call_args, _ = save_calendar_mock.call_args
+    data = call_args[0]
+    assert "tasks" in data
+    assert "normal" in data["tasks"]
+    assert str(year) in data["tasks"]["normal"]
+    assert str(month) in data["tasks"]["normal"][str(year)]
+    assert str(day) in data["tasks"]["normal"][str(year)][str(month)]
+    assert len(data["tasks"]["normal"][str(year)][str(month)][str(day)]) == 1
+
+    task_data = data["tasks"]["normal"][str(year)][str(month)][str(day)][0]
+
+    assert "title" in task_data
+    assert task_data["title"] == title
+    assert task_data["is_all_day"] is False
+    assert task_data["start_time"] == start_time
+    assert task_data["end_time"] == end_time
+
+
 def test_hidden_montly_monthday_repetitions_dont_appear(calendar_data: CalendarData,) -> None:
     year = 2017
     month = 12