diff --git a/Cargo.toml b/Cargo.toml
index 137f9b3..465d42b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,4 +9,5 @@ tui = "0.8.0"
 termion = "1.5"
 serde_json = "1"
 serde = { version = "1", features = ["derive"] }
-time = { version = "0.2", features = ["serde"] }
+time = { version = "0.2.9", features = ["serde"] }
+itertools = "0.9"
diff --git a/src/main.rs b/src/main.rs
index 5513c93..d0d606e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,9 +3,9 @@ use std::io;
 use termion::raw::IntoRawMode;
 use tui::backend::TermionBackend;
 use tui::Terminal;
+mod timesheet;
 mod todolist;
 mod tracc;
-mod timesheet;
 use tracc::Tracc;
 
 fn main() -> Result<(), io::Error> {
diff --git a/src/timesheet.rs b/src/timesheet.rs
index 5a61e04..0a66755 100644
--- a/src/timesheet.rs
+++ b/src/timesheet.rs
@@ -1,104 +1,150 @@
+use super::tracc::ListView;
+use itertools::Itertools;
 use serde::{Deserialize, Serialize};
 use serde_json::from_reader;
 use std::fmt;
 use std::fs::File;
 use std::io::BufReader;
-use time::Time;
+use time::OffsetDateTime;
 
 pub struct TimeSheet {
     pub times: Vec<TimePoint>,
     pub selected: usize,
     pub register: Option<TimePoint>,
+    pub editing_time: bool,
 }
 
-#[derive(Serialize, Deserialize, Clone)]
+#[derive(Serialize, Deserialize, Clone, Debug)]
 pub struct TimePoint {
     text: String,
-    time: Time,
+    time: OffsetDateTime,
 }
 
 impl TimePoint {
     pub fn new(text: &str) -> Self {
         Self {
             text: String::from(text),
-            time: Time::now(),
+            time: OffsetDateTime::now_local(),
         }
     }
 }
 
 impl fmt::Display for TimePoint {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "[{}] {}", self.time.format("%H:%M"), self.text)
+        write!(
+            f,
+            "[{}] {}",
+            self.time
+                .to_offset(time::UtcOffset::current_local_offset())
+                .format("%H:%M"),
+            self.text
+        )
     }
 }
 
+fn read_times(path: &str) -> Option<Vec<TimePoint>> {
+    File::open(path)
+        .ok()
+        .map(|f| BufReader::new(f))
+        .and_then(|r| from_reader(r).ok())
+}
+
 impl TimeSheet {
-    pub fn new() -> Self {
+    pub fn open_or_create(path: &str) -> Self {
         Self {
-            times: vec![
-                TimePoint::new("A test value"),
-                TimePoint::new("A second test value"),
-            ],
+            times: read_times(path).unwrap_or(vec![TimePoint::new("Did something")]),
             selected: 0,
             register: None,
+            editing_time: false,
         }
     }
 
     pub fn printable(&self) -> Vec<String> {
         self.times.iter().map(TimePoint::to_string).collect()
     }
+
+    fn current(&self) -> &TimePoint {
+        &self.times[self.selected]
+    }
+
+    pub fn time_by_tasks(&self) -> String {
+        let mut time_by_task = std::collections::HashMap::new();
+        let durations = self
+            .times
+            //.iter()
+            //.tuple_windows()
+            .windows(2)
+            .map(|ts| {
+                let prev = &ts[0];
+                let next = &ts[1];
+                let diff = next.time - prev.time;
+                (prev.text.clone(), diff)
+            });
+        //.fold(
+        //std::collections::HashMap::new(),
+        //|mut map, (text, duration)| {
+        // *map.entry(text).or_insert(time::Duration::zero()) += duration;
+        // map
+        //},
+        //);
+        for (text, duration) in durations {
+            *time_by_task.entry(text).or_insert(time::Duration::zero()) += duration;
+        }
+        let mut times: Vec<_> = time_by_task
+            .into_iter()
+            .map(|(text, duration)| format!("{}: {}", text, format_duration(&duration)))
+            .collect();
+        times.sort();
+        times.join("; ")
+    }
+
+    pub fn sum_as_str(&self) -> String {
+        let total = self
+            .times
+            .windows(2)
+            .fold(time::Duration::zero(), |total, ts| {
+                let last = ts[0].time;
+                let next = ts[1].time;
+                total + (next - last)
+            });
+        format_duration(&total)
+    }
 }
-/*
-impl TimeSheet {
-    pub fn selection_down(&mut self) {
-        self.selected = (self.selected + 1).min(self.todos.len().saturating_sub(1));
+
+fn format_duration(d: &time::Duration) -> String {
+    format!("{}:{:02}", d.whole_hours(), d.whole_minutes().max(1) % 60)
+}
+
+impl ListView<TimePoint> for TimeSheet {
+    fn selection_pointer(&mut self) -> &mut usize {
+        &mut self.selected
     }
 
-    pub fn selection_up(&mut self) {
-        self.selected = self.selected.saturating_sub(1);
+    fn list(&mut self) -> &mut Vec<TimePoint> {
+        &mut self.times
     }
 
-    pub fn insert(&mut self, todo: Todo) {
-        if self.selected == self.todos.len().saturating_sub(1) {
-            self.todos.push(todo);
-            self.selected = self.todos.len() - 1;
-        } else {
-            self.todos.insert(self.selected + 1, todo);
-            self.selected += 1;
-        }
+    fn register(&mut self) -> &mut Option<TimePoint> {
+        &mut self.register
     }
 
-    pub fn remove_current(&mut self) -> Option<Todo> {
-        if self.todos.is_empty() {
-            return None;
-        }
-        let index = self.selected;
-        self.selected = index.min(self.todos.len().saturating_sub(2));
-        return Some(self.todos.remove(index));
-    }
-
-    pub fn toggle_current(&mut self) {
-        self.todos[self.selected].done = !self.todos[self.selected].done;
-    }
-
-    fn current(&self) -> &Todo {
-        &self.todos[self.selected]
-    }
-
-    pub fn normal_mode(&mut self) {
+    fn normal_mode(&mut self) {
         if self.current().text.is_empty() {
             self.remove_current();
             self.selected = self.selected.saturating_sub(1);
         }
+        self.times.sort_by_key(|t| t.time);
     }
 
-    pub fn append_to_current(&mut self, chr: char) {
-        self.todos[self.selected].text.push(chr);
+    fn toggle_current(&mut self) {
+        self.editing_time = !self.editing_time;
     }
 
-    pub fn current_pop(&mut self) {
-        self.todos[self.selected].text.pop();
+    fn append_to_current(&mut self, chr: char) {
+        self.times[self.selected].text.push(chr);
     }
 
+    fn backspace(&mut self) {
+        self.times[self.selected].text.pop();
+    }
 }
-*/
diff --git a/src/todolist.rs b/src/todolist.rs
index 8412f5a..866f4e8 100644
--- a/src/todolist.rs
+++ b/src/todolist.rs
@@ -1,9 +1,9 @@
+use crate::tracc::ListView;
 use serde::{Deserialize, Serialize};
 use serde_json::from_reader;
-use std::fs::File;
 use std::fmt;
+use std::fs::File;
 use std::io::BufReader;
-use crate::tracc::ListView;
 
 pub struct TodoList {
     pub todos: Vec<Todo>,
@@ -29,7 +29,7 @@ impl Todo {
 
 impl fmt::Display for Todo {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-       write!(f, "[{}] {}", if self.done { 'x' } else { ' ' }, self.text)
+        write!(f, "[{}] {}", if self.done { 'x' } else { ' ' }, self.text)
     }
 }
 
@@ -42,49 +42,29 @@ fn read_todos(path: &str) -> Option<Vec<Todo>> {
 
 impl TodoList {
     pub fn open_or_create(path: &str) -> Self {
-        TodoList {
+        Self {
             todos: read_todos(path).unwrap_or(vec![Todo::new("This is a list entry")]),
             selected: 0,
             register: None,
         }
     }
 
-    pub fn toggle_current(&mut self) {
-        self.todos[self.selected].done = !self.todos[self.selected].done;
-    }
-
     fn current(&self) -> &Todo {
         &self.todos[self.selected]
     }
 }
 
 impl ListView<Todo> for TodoList {
-    fn selection_down(&mut self) {
-        self.selected = (self.selected + 1).min(self.todos.len().saturating_sub(1));
+    fn selection_pointer(&mut self) -> &mut usize {
+        &mut self.selected
     }
 
-    fn selection_up(&mut self) {
-        self.selected = self.selected.saturating_sub(1);
+    fn list(&mut self) -> &mut Vec<Todo> {
+        &mut self.todos
     }
 
-    fn insert<P>(&mut self, todo: Todo, position: P) where P: Into<Option<usize>> {
-        let pos = position.into().unwrap_or(self.selected);
-        if pos == self.todos.len().saturating_sub(1) {
-            self.todos.push(todo);
-            self.selected = self.todos.len() - 1;
-        } else {
-            self.todos.insert(pos + 1, todo);
-            self.selected = pos + 1;
-        }
-    }
-
-    fn remove_current(&mut self) {
-        if self.todos.is_empty() {
-            return;
-        }
-        let index = self.selected;
-        self.selected = index.min(self.todos.len().saturating_sub(2));
-        self.register = self.todos.remove(index).into();
+    fn register(&mut self) -> &mut Option<Todo> {
+        &mut self.register
     }
 
     fn normal_mode(&mut self) {
@@ -102,14 +82,7 @@ impl ListView<Todo> for TodoList {
         self.todos[self.selected].text.pop();
     }
 
-    fn printable(&self) -> Vec<String> {
-        self.todos.iter().map(Todo::to_string).collect()
-    }
-
-    fn paste(&mut self) {
-        if self.register.is_some() {
-            // Is there a better way?
-            self.insert(self.register.as_ref().unwrap().clone(), None);
-        }
+    fn toggle_current(&mut self) {
+        self.todos[self.selected].done = !self.todos[self.selected].done;
     }
 }
diff --git a/src/tracc.rs b/src/tracc.rs
index 213de43..ae71018 100644
--- a/src/tracc.rs
+++ b/src/tracc.rs
@@ -1,6 +1,7 @@
+use super::timesheet::{TimePoint, TimeSheet};
 use super::todolist::TodoList;
-use super::timesheet::TimeSheet;
 use std::default::Default;
+use std::fmt;
 use std::io::{self, Write};
 use termion::event::Key;
 use termion::input::TermRead;
@@ -10,7 +11,8 @@ use tui::style::{Color, Style};
 use tui::widgets::*;
 
 type Terminal = tui::Terminal<TermionBackend<termion::raw::RawTerminal<io::Stdout>>>;
-const JSON_PATH: &str = "tracc.json";
+const JSON_PATH_TIME: &str = "tracc_time.json";
+const JSON_PATH_TODO: &str = "tracc_todo.json";
 
 pub enum Mode {
     Insert,
@@ -34,8 +36,8 @@ pub struct Tracc {
 impl Tracc {
     pub fn new(terminal: Terminal) -> Self {
         Self {
-            todos: TodoList::open_or_create(JSON_PATH),
-            times: TimeSheet::new(),
+            todos: TodoList::open_or_create(JSON_PATH_TODO),
+            times: TimeSheet::open_or_create(JSON_PATH_TIME),
             terminal,
             input_mode: Mode::Normal,
             focus: Focus::Top,
@@ -51,21 +53,39 @@ impl Tracc {
             match self.input_mode {
                 Mode::Normal => match input {
                     Key::Char('q') => break,
-                    Key::Char('j') => self.todos.selection_down(),
-                    Key::Char('k') => self.todos.selection_up(),
+                    Key::Char('j') => match self.focus {
+                        Focus::Top => self.todos.selection_down(),
+                        Focus::Bottom => self.times.selection_down(),
+                    },
+                    Key::Char('k') => match self.focus {
+                        Focus::Top => self.todos.selection_up(),
+                        Focus::Bottom => self.times.selection_up(),
+                    },
                     Key::Char('o') => {
-                        self.todos.insert(Default::default(), None);
+                        match self.focus {
+                            Focus::Top => self.todos.insert(Default::default(), None),
+                            Focus::Bottom => self.times.insert(TimePoint::new(""), None),
+                        }
                         self.set_mode(Mode::Insert)?;
                     }
                     Key::Char('a') | Key::Char('A') => self.set_mode(Mode::Insert)?,
-                    Key::Char(' ') => self.todos.toggle_current(),
+                    Key::Char(' ') => match self.focus {
+                        Focus::Top => self.todos.toggle_current(),
+                        Focus::Bottom => self.times.toggle_current(),
+                    },
                     // dd
                     Key::Char('d') => {
                         if let Key::Char('d') = inputs.next().unwrap()? {
-                            self.todos.remove_current()
+                            match self.focus {
+                                Focus::Top => self.todos.remove_current(),
+                                Focus::Bottom => self.times.remove_current(),
+                            }
                         }
                     }
-                    Key::Char('p') => self.todos.paste(),
+                    Key::Char('p') => match self.focus {
+                        Focus::Top => self.todos.paste(),
+                        Focus::Bottom => self.times.paste(),
+                    },
                     Key::Char('\t') => {
                         self.focus = match self.focus {
                             Focus::Top => Focus::Bottom,
@@ -76,14 +96,20 @@ impl Tracc {
                 },
                 Mode::Insert => match input {
                     Key::Char('\n') | Key::Esc => self.set_mode(Mode::Normal)?,
-                    Key::Backspace => self.todos.backspace(),
-                    Key::Char(x) => self.todos.append_to_current(x),
+                    Key::Backspace => match self.focus {
+                        Focus::Top => self.todos.backspace(),
+                        Focus::Bottom => self.times.backspace(),
+                    },
+                    Key::Char(x) => match self.focus {
+                        Focus::Top => self.todos.append_to_current(x),
+                        Focus::Bottom => self.times.append_to_current(x),
+                    },
                     _ => (),
                 },
             };
         }
         self.terminal.clear()?;
-        persist_todos(&self.todos, JSON_PATH);
+        persist_state(&self.todos, &self.times);
         Ok(())
     }
 
@@ -92,6 +118,7 @@ impl Tracc {
             Mode::Insert => self.terminal.show_cursor()?,
             Mode::Normal => {
                 self.todos.normal_mode();
+                self.times.normal_mode();
                 self.terminal.hide_cursor()?
             }
         };
@@ -121,6 +148,8 @@ impl Tracc {
         let top_focus = Some(self.todos.selected).filter(|_| self.focus == Focus::Top);
         let printable_times = self.times.printable();
         let bottom_focus = Some(self.times.selected).filter(|_| self.focus == Focus::Bottom);
+        let total_time = self.times.sum_as_str();
+        let times = self.times.time_by_tasks();
 
         self.terminal.draw(|mut frame| {
             let size = frame.size();
@@ -137,36 +166,91 @@ impl Tracc {
                 .split(size);
             selectable_list(" t r a c c ", &printable_todos, top_focus)
                 .render(&mut frame, chunks[0]);
-            selectable_list(" 🕑 ", &printable_times, bottom_focus)
-                .render(&mut frame, chunks[1]);
-            Paragraph::new([Text::raw("Sum for today: 1:12")].iter())
-                .block(Block::default().borders(Borders::ALL))
-                .render(&mut frame, chunks[2]);
+            selectable_list(" 🕑 ", &printable_times, bottom_focus).render(&mut frame, chunks[1]);
+            Paragraph::new(
+                [Text::raw(format!(
+                    "Sum for today: {}\n{}",
+                    total_time, times
+                ))]
+                .iter(),
+            )
+            .block(Block::default().borders(Borders::ALL))
+            .render(&mut frame, chunks[2]);
         })?;
         Ok(())
     }
 }
 
-fn persist_todos(todos: &TodoList, path: &str) {
-    let string = serde_json::to_string(&todos.todos).unwrap();
-    std::fs::OpenOptions::new()
-        .create(true)
-        .write(true)
-        .truncate(true)
-        .open(path)
-        .ok()
-        .or_else(|| panic!("Can’t save todos to JSON. Dumping raw data:\n{}", string))
-        .map(|mut f| f.write(string.as_bytes()));
+fn persist_state(todos: &TodoList, times: &TimeSheet) {
+    fn write(path: &str, content: String) {
+        std::fs::OpenOptions::new()
+            .create(true)
+            .write(true)
+            .truncate(true)
+            .open(path)
+            .ok()
+            .or_else(|| panic!("Can’t save state to JSON. Dumping raw data:\n{}", content))
+            .map(|mut f| f.write(content.as_bytes()));
+    }
+    let todos = serde_json::to_string(&todos.todos).unwrap();
+    write(JSON_PATH_TODO, todos);
+    let times = serde_json::to_string(&times.times).unwrap();
+    write(JSON_PATH_TIME, times);
 }
 
-pub trait ListView<T: std::fmt::Display> {
-    fn printable(&self) -> Vec<String>;
-    fn selection_up(&mut self);
-    fn selection_down(&mut self);
-    fn insert<P>(&mut self, todo: T, position: P) where P: Into<Option<usize>>;
-    fn paste(&mut self);
-    fn remove_current(&mut self);
+pub trait ListView<T: fmt::Display + Clone> {
+    // get properties of implementations
+    fn selection_pointer(&mut self) -> &mut usize;
+    fn list(&mut self) -> &mut Vec<T>;
+    fn register(&mut self) -> &mut Option<T>;
+
+    // specific input handling
     fn backspace(&mut self);
     fn append_to_current(&mut self, chr: char);
     fn normal_mode(&mut self);
+    fn toggle_current(&mut self);
+
+    // selection manipulation
+    fn selection_up(&mut self) {
+        *self.selection_pointer() = self.selection_pointer().saturating_sub(1);
+    }
+
+    fn selection_down(&mut self) {
+        *self.selection_pointer() =
+            (*self.selection_pointer() + 1).min(self.list().len().saturating_sub(1));
+    }
+
+    // adding/removing elements
+    fn insert(&mut self, item: T, position: Option<usize>) {
+        let pos = position.unwrap_or(*self.selection_pointer());
+        if pos == self.list().len().saturating_sub(1) {
+            self.list().push(item);
+            *self.selection_pointer() = self.list().len() - 1;
+        } else {
+            self.list().insert(pos + 1, item);
+            *self.selection_pointer() = pos + 1;
+        }
+    }
+
+    fn remove_current(&mut self) {
+        if self.list().is_empty() {
+            return;
+        }
+        let index = *self.selection_pointer();
+        *self.selection_pointer() = index.min(self.list().len().saturating_sub(2));
+        *self.register() = self.list().remove(index).into();
+    }
+
+    fn paste(&mut self) {
+        let register = self.register().clone();
+        match register {
+            Some(item) => self.insert(item, None),
+            None => (),
+        }
+    }
+
+    // printing
+    fn printable(&mut self) -> Vec<String> {
+        self.list().iter().map(T::to_string).collect()
+    }
 }