diff --git a/working_time/hooks.py b/working_time/hooks.py
index 3bb1dea..4dc58b3 100644
--- a/working_time/hooks.py
+++ b/working_time/hooks.py
@@ -57,7 +57,7 @@
 # ------------
 
 # before_install = "working_time.install.before_install"
-# after_install = "working_time.install.after_install"
+after_install = "working_time.install.after_install"
 
 # Uninstallation
 # ------------
diff --git a/working_time/install.py b/working_time/install.py
new file mode 100644
index 0000000..cd8cc37
--- /dev/null
+++ b/working_time/install.py
@@ -0,0 +1,87 @@
+# Copyright (c) 2023, ALYF GmbH and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.custom.doctype.custom_field.custom_field import create_custom_fields
+
+
+def after_install():
+    customize_project()
+    customize_timesheet()
+    insert_docs()
+
+
+def customize_project():
+    custom_fields = {
+        "Project": [
+            {
+                "fieldname": "billing_rate",
+                "label": "Billing Rate per Hour",
+                "fieldtype": "Currency",
+                "options": "currency",
+                "insert_after": "cost_center",
+                "translatable": 0,
+            },
+            {
+                "fieldname": "jira_section",
+                "label": "Jira",
+                "fieldtype": "Section Break",
+                "insert_after": "message",
+                "collapsible": 1,
+            },
+            {
+                "fieldname": "jira_site",
+                "label": "Site",
+                "fieldtype": "Link",
+                "options": "Jira Site",
+                "insert_after": "jira_section",
+                "translatable": 0,
+            },
+        ]
+    }
+
+    create_custom_fields(custom_fields)
+
+
+def customize_timesheet():
+    custom_fields = {
+        "Timesheet Detail": [
+            {
+                "fieldname": "jira_section",
+                "label": "Jira",
+                "fieldtype": "Section Break",
+                "insert_after": "costing_amount",
+            },
+            {
+                "fieldname": "jira_issue_url",
+                "label": "Issue URL",
+                "fieldtype": "Data",
+                "Options": "URL",
+                "insert_after": "jira_section",
+                "read_only": 1,
+                "translatable": 0,
+            },
+        ]
+    }
+
+    create_custom_fields(custom_fields)
+
+
+def insert_docs():
+    docs = [
+        {
+            "doctype": "Activity Type",
+            "activity_type": "Default",
+        }
+    ]
+
+    for doc in docs:
+        filters = doc.copy()
+
+        # Clean up filters. They need to be a plain dict without nested dicts or lists.
+        for key, value in doc.items():
+            if isinstance(value, (list, dict)):
+                del filters[key]
+
+        if not frappe.db.exists(filters):
+            frappe.get_doc(doc).insert(ignore_if_duplicate=True)
diff --git a/working_time/jira_client.py b/working_time/jira_client.py
new file mode 100644
index 0000000..1d4f1a9
--- /dev/null
+++ b/working_time/jira_client.py
@@ -0,0 +1,47 @@
+# Copyright (c) 2023, ALYF GmbH and contributors
+# For license information, please see license.txt
+
+
+import json
+
+import frappe
+from frappe import _
+import requests
+from requests.auth import HTTPBasicAuth
+
+
+class JiraClient:
+    def __init__(self, jira_site: str) -> None:
+        jira_site = frappe.get_doc("Jira Site", jira_site)
+
+        self.url = f"https://{jira_site.name}"
+        self.session = requests.Session()
+        self.session.auth = HTTPBasicAuth(
+            jira_site.username, jira_site.get_password(fieldname="api_token")
+        )
+        self.session.headers = {"Accept": "application/json"}
+
+    def get(self, url: str, params=None):
+        response = self.session.get(url, params=params)
+
+        try:
+            response.raise_for_status()
+        except requests.HTTPError:
+            error_text = json.loads(response.text)
+            error_message = (
+                error_text.get("errorMessage")
+                or (error_text.get("errorMessages") or [None])[0]
+                or "Something went wrong."
+            )
+
+            frappe.throw(f"{url}: {_(error_message)}")
+
+        return response.json()
+
+    def get_issue_summary(self, key: str) -> str:
+        url = f"{self.url}/rest/api/2/issue/{key}"
+        params = {
+            "fields": "summary",
+        }
+
+        return self.get(url, params=params).get("fields").get("summary")
diff --git a/working_time/patches.txt b/working_time/patches.txt
index e69de29..4c0f661 100644
--- a/working_time/patches.txt
+++ b/working_time/patches.txt
@@ -0,0 +1 @@
+working_time.patches.migrate_old_working_times
\ No newline at end of file
diff --git a/working_time/patches/migrate_old_working_times.py b/working_time/patches/migrate_old_working_times.py
new file mode 100644
index 0000000..02db957
--- /dev/null
+++ b/working_time/patches/migrate_old_working_times.py
@@ -0,0 +1,16 @@
+import frappe
+
+
+def execute():
+    doc_names = frappe.get_all("Working Time", pluck="name")
+
+    for doc_name in doc_names:
+        date, break_time, working_time = frappe.db.get_value(
+            "Working Time", doc_name, ["from_date", "break_duration", "total_duration"]
+        )
+        frappe.db.set_value(
+            "Working Time",
+            doc_name,
+            {"date": date, "break_time": break_time, "working_time": working_time},
+            update_modified=False,
+        )
diff --git a/working_time/working_time/doctype/__init__.py b/working_time/working_time/doctype/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/working_time/working_time/doctype/jira_site/__init__.py b/working_time/working_time/doctype/jira_site/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/working_time/working_time/doctype/jira_site/jira_site.js b/working_time/working_time/doctype/jira_site/jira_site.js
new file mode 100644
index 0000000..b4090b6
--- /dev/null
+++ b/working_time/working_time/doctype/jira_site/jira_site.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2023, ALYF GmbH and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Jira Site', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/working_time/working_time/doctype/jira_site/jira_site.json b/working_time/working_time/doctype/jira_site/jira_site.json
new file mode 100644
index 0000000..f0dbb37
--- /dev/null
+++ b/working_time/working_time/doctype/jira_site/jira_site.json
@@ -0,0 +1,71 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "autoname": "field:site_url",
+ "creation": "2023-01-30 10:07:01.823009",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "site_url",
+  "column_break_2",
+  "username",
+  "column_break_4",
+  "api_token"
+ ],
+ "fields": [
+  {
+   "description": "e.g. your-domain.atlassian.net",
+   "fieldname": "site_url",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Site URL",
+   "reqd": 1,
+   "unique": 1
+  },
+  {
+   "fieldname": "column_break_2",
+   "fieldtype": "Section Break"
+  },
+  {
+   "fieldname": "username",
+   "fieldtype": "Data",
+   "label": "Username",
+   "reqd": 1
+  },
+  {
+   "fieldname": "api_token",
+   "fieldtype": "Password",
+   "label": "API Token",
+   "reqd": 1
+  },
+  {
+   "fieldname": "column_break_4",
+   "fieldtype": "Column Break"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [],
+ "modified": "2023-01-30 10:13:44.680028",
+ "modified_by": "Administrator",
+ "module": "Working Time",
+ "name": "Jira Site",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "title_field": "site_url"
+}
\ No newline at end of file
diff --git a/working_time/working_time/doctype/jira_site/jira_site.py b/working_time/working_time/doctype/jira_site/jira_site.py
new file mode 100644
index 0000000..9288c71
--- /dev/null
+++ b/working_time/working_time/doctype/jira_site/jira_site.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2023, ALYF GmbH and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class JiraSite(Document):
+	pass
diff --git a/working_time/working_time/doctype/jira_site/test_jira_site.py b/working_time/working_time/doctype/jira_site/test_jira_site.py
new file mode 100644
index 0000000..fc51308
--- /dev/null
+++ b/working_time/working_time/doctype/jira_site/test_jira_site.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2023, ALYF GmbH and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestJiraSite(unittest.TestCase):
+	pass
diff --git a/working_time/working_time/doctype/working_time/__init__.py b/working_time/working_time/doctype/working_time/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/working_time/working_time/doctype/working_time/test_working_time.py b/working_time/working_time/doctype/working_time/test_working_time.py
new file mode 100644
index 0000000..8182ea5
--- /dev/null
+++ b/working_time/working_time/doctype/working_time/test_working_time.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2023, ALYF GmbH and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestWorkingTime(unittest.TestCase):
+	pass
diff --git a/working_time/working_time/doctype/working_time/working_time.js b/working_time/working_time/doctype/working_time/working_time.js
new file mode 100644
index 0000000..596e9b2
--- /dev/null
+++ b/working_time/working_time/doctype/working_time/working_time.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2023, ALYF GmbH and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on("Working Time", {
+    setup: function (frm) {
+        frm.set_query("employee", "erpnext.controllers.queries.employee_query");
+    },
+});
+
+frappe.ui.form.on("Working Time Log", {
+    time_logs_add: function (frm, cdt, cdn) {
+        let row = locals[cdt][cdn];
+        row.from_time = frappe.datetime.now_time(false);
+        row.to_time = ""; // Otherwise Frappe may overwrite empty values with the current time on save.
+        frm.refresh_field("time_logs");
+    },
+});
diff --git a/working_time/working_time/doctype/working_time/working_time.json b/working_time/working_time/doctype/working_time/working_time.json
new file mode 100644
index 0000000..bd2d781
--- /dev/null
+++ b/working_time/working_time/doctype/working_time/working_time.json
@@ -0,0 +1,114 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "creation": "2023-01-20 19:47:31.767082",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "employee",
+  "column_break_2",
+  "employee_name",
+  "section_break_4",
+  "date",
+  "time_logs",
+  "section_break_7",
+  "break_time",
+  "working_time",
+  "amended_from"
+ ],
+ "fields": [
+  {
+   "fieldname": "employee",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Employee",
+   "options": "Employee",
+   "reqd": 1
+  },
+  {
+   "fieldname": "column_break_2",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fetch_from": "employee.employee_name",
+   "fieldname": "employee_name",
+   "fieldtype": "Data",
+   "label": "Employee Name",
+   "read_only": 1
+  },
+  {
+   "fieldname": "section_break_4",
+   "fieldtype": "Section Break"
+  },
+  {
+   "default": "Today",
+   "fieldname": "date",
+   "fieldtype": "Date",
+   "in_list_view": 1,
+   "label": "Date",
+   "reqd": 1
+  },
+  {
+   "fieldname": "amended_from",
+   "fieldtype": "Link",
+   "label": "Amended From",
+   "no_copy": 1,
+   "options": "Working Time",
+   "print_hide": 1,
+   "read_only": 1
+  },
+  {
+   "fieldname": "working_time",
+   "fieldtype": "Duration",
+   "hide_days": 1,
+   "hide_seconds": 1,
+   "in_list_view": 1,
+   "label": "Working Time",
+   "read_only": 1
+  },
+  {
+   "fieldname": "time_logs",
+   "fieldtype": "Table",
+   "label": "Time Logs",
+   "options": "Working Time Log"
+  },
+  {
+   "fieldname": "break_time",
+   "fieldtype": "Duration",
+   "hide_days": 1,
+   "hide_seconds": 1,
+   "label": "Break",
+   "read_only": 1
+  },
+  {
+   "fieldname": "section_break_7",
+   "fieldtype": "Section Break"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "is_submittable": 1,
+ "links": [],
+ "modified": "2023-01-25 01:15:25.964552",
+ "modified_by": "Administrator",
+ "module": "Working Time",
+ "name": "Working Time",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "title_field": "employee_name"
+}
\ No newline at end of file
diff --git a/working_time/working_time/doctype/working_time/working_time.py b/working_time/working_time/doctype/working_time/working_time.py
new file mode 100644
index 0000000..675bd45
--- /dev/null
+++ b/working_time/working_time/doctype/working_time/working_time.py
@@ -0,0 +1,148 @@
+# Copyright (c) 2023, ALYF GmbH and contributors
+# For license information, please see license.txt
+
+import math
+
+import frappe
+from frappe import _
+from frappe.model.document import Document
+from frappe.utils import time_diff_in_seconds
+from working_time.jira_client import JiraClient
+
+HALF_DAY = 3.25
+OVERTIME_FACTOR = 1.15
+MAX_HALF_DAY = HALF_DAY * OVERTIME_FACTOR * 60 * 60
+FIVE_MINUTES = 5 * 60
+ONE_HOUR = 60 * 60
+
+
+class WorkingTime(Document):
+    def before_validate(self):
+        self.remove_seconds()
+        self.set_to_times()
+        self.set_durations()
+
+    def validate(self):
+        for log in self.time_logs:
+            if log.duration and log.duration < 0:
+                frappe.throw(_("Time logs must be continuous"))
+
+    def on_submit(self):
+        self.create_attendance()
+        self.create_timesheets()
+
+    def remove_seconds(self):
+        for log in self.time_logs:
+            if log.from_time:
+                log.from_time = f"{log.from_time[:-2]}00"
+
+            if log.to_time:
+                log.to_time = f"{log.to_time[:-2]}00"
+
+    def set_to_times(self):
+        for i in range(0, len(self.time_logs) - 1):
+            self.time_logs[i].to_time = self.time_logs[i + 1].from_time
+
+    def set_durations(self):
+        self.break_time = 0
+        self.working_time = 0
+
+        for log in self.time_logs:
+            if log.from_time and log.to_time:
+                log.duration = time_diff_in_seconds(log.to_time, log.from_time)
+
+            if log.duration:
+                if log.is_break:
+                    self.break_time += log.duration
+                else:
+                    self.working_time += log.duration
+
+    def create_attendance(self):
+        if not frappe.db.exists(
+            "Attendance", {"employee": self.employee, "attendance_date": self.date}
+        ):
+            attendance = frappe.get_doc(
+                {
+                    "doctype": "Attendance",
+                    "employee": self.employee,
+                    "status": "Present"
+                    if self.working_time > MAX_HALF_DAY
+                    else "Half Day",
+                    "attendance_date": self.date,
+                }
+            )
+            attendance.flags.ignore_permissions = True
+            attendance.save()
+            attendance.submit()
+
+    def create_timesheets(self):
+        for log in self.time_logs:
+            if log.duration and log.project:
+                costing_rate = get_costing_rate(self.employee)
+                hours = math.ceil(log.duration / FIVE_MINUTES) * FIVE_MINUTES / ONE_HOUR
+                billing_hours = (
+                    math.ceil(
+                        log.duration * float(log.billable[:-1]) / 100 / FIVE_MINUTES
+                    )
+                    * FIVE_MINUTES
+                    / ONE_HOUR
+                )
+
+                customer, billing_rate, jira_site = frappe.get_value(
+                    "Project",
+                    log.project,
+                    ["customer", "billing_rate", "jira_site"],
+                )
+
+                frappe.get_doc(
+                    {
+                        "doctype": "Timesheet",
+                        "time_logs": [
+                            {
+                                "is_billable": 1,
+                                "project": log.project,
+                                "activity_type": "Default",
+                                "base_billing_rate": billing_rate,
+                                "base_costing_rate": costing_rate,
+                                "costing_rate": costing_rate,
+                                "billing_rate": billing_rate,
+                                "hours": hours,
+                                "from_time": self.date,
+                                "billing_hours": billing_hours,
+                                "description": get_description(
+                                    jira_site, log.key, log.note
+                                ),
+                                "jira_issue_url": get_jira_issue_url(
+                                    jira_site, log.key
+                                ),
+                            }
+                        ],
+                        "parent_project": log.project,
+                        "customer": customer,
+                        "employee": self.employee,
+                    }
+                ).insert()
+
+
+def get_costing_rate(employee):
+    return frappe.get_value(
+        "Activity Cost",
+        {"activity_type": "Default", "employee": employee},
+        "costing_rate",
+    )
+
+
+def get_jira_issue_url(jira_site, key):
+    return f"https://{jira_site}/browse/{key}" if key else None
+
+
+def get_description(jira_site, key, note):
+    if key:
+        description = f"{JiraClient(jira_site).get_issue_summary(key)} ({key})"
+
+        if note:
+            description += f":\n\n{note}"
+    else:
+        description = note or "-"
+
+    return description
diff --git a/working_time/working_time/doctype/working_time_log/__init__.py b/working_time/working_time/doctype/working_time_log/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/working_time/working_time/doctype/working_time_log/working_time_log.json b/working_time/working_time/doctype/working_time_log/working_time_log.json
new file mode 100644
index 0000000..3e68567
--- /dev/null
+++ b/working_time/working_time/doctype/working_time_log/working_time_log.json
@@ -0,0 +1,108 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "creation": "2023-01-20 20:02:56.531992",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "from_time",
+  "to_time",
+  "column_break_3",
+  "duration",
+  "billable",
+  "section_break_5",
+  "project",
+  "key",
+  "note",
+  "section_break_9",
+  "is_break"
+ ],
+ "fields": [
+  {
+   "columns": 1,
+   "fieldname": "duration",
+   "fieldtype": "Duration",
+   "hide_days": 1,
+   "hide_seconds": 1,
+   "in_list_view": 1,
+   "label": "Duration",
+   "read_only": 1
+  },
+  {
+   "columns": 1,
+   "fieldname": "project",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Project",
+   "options": "Project"
+  },
+  {
+   "columns": 1,
+   "fieldname": "key",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Key"
+  },
+  {
+   "fieldname": "note",
+   "fieldtype": "Small Text",
+   "in_list_view": 1,
+   "label": "Note"
+  },
+  {
+   "columns": 1,
+   "fieldname": "from_time",
+   "fieldtype": "Time",
+   "in_list_view": 1,
+   "label": "From",
+   "reqd": 1
+  },
+  {
+   "columns": 1,
+   "fieldname": "to_time",
+   "fieldtype": "Time",
+   "in_list_view": 1,
+   "label": "To"
+  },
+  {
+   "columns": 1,
+   "default": "0",
+   "fieldname": "is_break",
+   "fieldtype": "Check",
+   "in_list_view": 1,
+   "label": "Break"
+  },
+  {
+   "fieldname": "column_break_3",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fieldname": "section_break_5",
+   "fieldtype": "Section Break"
+  },
+  {
+   "fieldname": "section_break_9",
+   "fieldtype": "Section Break"
+  },
+  {
+   "default": "100%",
+   "depends_on": "eval: doc.project",
+   "fieldname": "billable",
+   "fieldtype": "Select",
+   "label": "Billable",
+   "options": "25%\n50%\n75%\n100%\n125%\n150%"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "istable": 1,
+ "links": [],
+ "modified": "2023-01-21 04:39:13.636311",
+ "modified_by": "Administrator",
+ "module": "Working Time",
+ "name": "Working Time Log",
+ "owner": "Administrator",
+ "permissions": [],
+ "sort_field": "modified",
+ "sort_order": "DESC"
+}
\ No newline at end of file
diff --git a/working_time/working_time/doctype/working_time_log/working_time_log.py b/working_time/working_time/doctype/working_time_log/working_time_log.py
new file mode 100644
index 0000000..9e11aee
--- /dev/null
+++ b/working_time/working_time/doctype/working_time_log/working_time_log.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2023, ALYF GmbH and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class WorkingTimeLog(Document):
+	pass