diff --git a/Cargo.lock b/Cargo.lock
index b62e131..d71976c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1055,6 +1055,7 @@ dependencies = [
  "chrono",
  "clap",
  "colored",
+ "common",
  "globalenv",
  "humantime",
  "once_cell",
diff --git a/common/src/lib.rs b/common/src/lib.rs
index 7733e33..7877013 100644
--- a/common/src/lib.rs
+++ b/common/src/lib.rs
@@ -3,5 +3,5 @@ mod misc;
 mod solution;
 
 pub use answer::Answer;
-pub use misc::load;
+pub use misc::{human_time, load};
 pub use solution::{DummySolution, Solution};
diff --git a/common/src/misc.rs b/common/src/misc.rs
index 503ce96..f42ec40 100644
--- a/common/src/misc.rs
+++ b/common/src/misc.rs
@@ -11,3 +11,17 @@ pub fn load_raw(year: u32, day: u32) -> io::Result<String> {
     let file = format!("data/{year}/{:02}.txt", day);
     fs::read_to_string(file)
 }
+
+pub fn human_time(time: u128) -> String {
+    const TIME_UNITS: &[&str] = &["ns", "μs", "ms", "s"];
+
+    let mut time = time;
+    for i in TIME_UNITS {
+        if time < 1000 {
+            return format!("{}{}", time, i);
+        }
+        time /= 1000;
+    }
+
+    format!("{}{}", time, TIME_UNITS.last().unwrap())
+}
diff --git a/scaffold/Cargo.toml b/scaffold/Cargo.toml
index ae8af05..4b6b470 100644
--- a/scaffold/Cargo.toml
+++ b/scaffold/Cargo.toml
@@ -10,6 +10,7 @@ anyhow = "1.0.75"
 chrono = "0.4.31"
 clap = { version = "4.4.8", features = ["derive"] }
 colored = "2.0.4"
+common = { path = "../common" }
 globalenv = "0.4.2"
 humantime = "2.1.0"
 once_cell = "1.18.0"
diff --git a/scaffold/src/args.rs b/scaffold/src/args.rs
index 5744740..fb7ca48 100644
--- a/scaffold/src/args.rs
+++ b/scaffold/src/args.rs
@@ -1,4 +1,5 @@
 use clap::Parser;
+use regex::Regex;
 use url::Url;
 
 use crate::misc::current_year;
@@ -28,6 +29,8 @@ pub enum SubCommand {
     /// Fetch the puzzle input for a given day and write to a file.
     /// Also creates a base solution file for the given day.
     Init(InitArgs),
+    /// Submit a solution to the Advent of Code server.
+    Submit(SubmitArgs),
 }
 
 #[derive(Parser, Debug)]
@@ -91,3 +94,57 @@ pub struct InitArgs {
     #[arg(default_value_t = current_year())]
     pub year: u16,
 }
+
+#[derive(Parser, Debug)]
+pub struct SubmitArgs {
+    /// Command to run to get the solution for the given day.
+    #[arg(
+        short,
+        long,
+        default_value = "cargo r -r -- run {{day}} {{part}} {{year}}"
+    )]
+    pub command: String,
+    /// A regex that will be used to extract the solution from the output of the command.
+    #[arg(long, default_value = r"OUT: (.*) \(")]
+    pub extraction_regex: Regex,
+    /// The group of the regex that contains the solution.
+    #[arg(long, default_value = "1")]
+    pub extraction_group: usize,
+    /// Don't actually submit the solution.
+    /// Useful for testing that the command and extraction regex are correct.
+    #[arg(short, long)]
+    pub dry_run: bool,
+
+    /// The day to submit the solution for.
+    pub day: u8,
+    /// The part to submit the solution for.
+    #[arg(value_parser = parse_part)]
+    pub part: Part,
+    /// The year to submit the solution for.
+    #[arg(default_value_t = current_year())]
+    pub year: u16,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum Part {
+    A,
+    B,
+}
+
+fn parse_part(s: &str) -> Result<Part, String> {
+    match s {
+        "a" => Ok(Part::A),
+        "b" => Ok(Part::B),
+        _ => Err("part must be `a` or `b`".to_owned()),
+    }
+}
+
+impl ToString for Part {
+    fn to_string(&self) -> String {
+        match self {
+            Part::A => "a",
+            Part::B => "b",
+        }
+        .to_owned()
+    }
+}
diff --git a/scaffold/src/commands/mod.rs b/scaffold/src/commands/mod.rs
index 9693875..b3d4790 100644
--- a/scaffold/src/commands/mod.rs
+++ b/scaffold/src/commands/mod.rs
@@ -2,3 +2,4 @@ pub mod init;
 pub mod timer;
 pub mod token;
 pub mod verify;
+pub mod submit;
\ No newline at end of file
diff --git a/scaffold/src/commands/submit.rs b/scaffold/src/commands/submit.rs
new file mode 100644
index 0000000..c5322b7
--- /dev/null
+++ b/scaffold/src/commands/submit.rs
@@ -0,0 +1,103 @@
+use std::{
+    process::{Command, Stdio},
+    time::Instant,
+};
+
+use anyhow::{Context, Result};
+use common::human_time;
+use scraper::Html;
+
+use crate::{
+    args::{Args, SubmitArgs},
+    formatter::Formatter,
+    session::{Authenticated, Session},
+};
+
+pub fn submit(session: &Session, cmd: &SubmitArgs, args: &Args) -> Result<()> {
+    let answer = get_answer(cmd).context("Getting answer")?;
+
+    if cmd.dry_run {
+        println!("[*] Aborting due to dry run");
+        return Ok(());
+    }
+
+    submit_answer(session, cmd, args, &answer).context("Submitting answer")?;
+    Ok(())
+}
+
+fn get_answer(cmd: &SubmitArgs) -> Result<String> {
+    let formats: &[(&str, String)] = &[
+        ("day", cmd.day.to_string()),
+        ("year", cmd.year.to_string()),
+        ("part", cmd.part.to_string()),
+    ];
+    let command = Formatter::new(&cmd.command)?.format(formats)?;
+    let args = shell_words::split(&command)?;
+    let executable = which::which(&args[0])?;
+
+    if cmd.dry_run {
+        println!("[*] Running command: {}", command);
+    }
+
+    let executable = Command::new(&executable)
+        .args(&args[1..])
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()?;
+
+    let start = Instant::now();
+    let output = executable.wait_with_output()?;
+    let time = start.elapsed().as_nanos();
+
+    if output.status.code() != Some(0) {
+        anyhow::bail!(
+            "Command failed with status code {}\n{}",
+            output.status,
+            String::from_utf8_lossy(&output.stderr)
+        );
+    }
+
+    let output = String::from_utf8_lossy(&output.stdout);
+    let answer = cmd
+        .extraction_regex
+        .captures(&output)
+        .context("Failed to extract answer, regex didn't match")?
+        .get(cmd.extraction_group)
+        .context("Failed to extract answer, too few capture groups")?
+        .as_str()
+        .trim()
+        .to_owned();
+
+    println!("[*] Answer: `{answer}` ({})", human_time(time));
+
+    Ok(answer)
+}
+
+fn submit_answer(session: &Session, cmd: &SubmitArgs, args: &Args, answer: &str) -> Result<()> {
+    let url = args
+        .address
+        .join(&format!("{}/day/{}/answer", cmd.year, cmd.day))?;
+
+    // POST https://adventofcode.com/{{year}}/day/{{day}}/answer
+    // level={{part:int}}&answer={{answer}}
+    let result = ureq::post(url.as_str())
+        .authenticated(session)
+        .send_form(&[
+            ("level", &(cmd.part as u8 + 1).to_string()),
+            ("answer", answer),
+        ])?;
+
+    let document = Html::parse_document(&result.into_string()?);
+    let result = document
+        .select(selector!("article p"))
+        .next()
+        .context("No response message found")?;
+    let result_text = result.text().collect::<Vec<_>>().join("");
+
+    // Remove duplicate whitespace
+    let result_text = regex!(r"[\[\(].*?[\]\)]").replace_all(&result_text, "");
+    let result_text = regex!(r"\s+").replace_all(&result_text, " ");
+
+    println!("[*] {result_text}");
+    Ok(())
+}
diff --git a/scaffold/src/main.rs b/scaffold/src/main.rs
index fd04d5c..b730c54 100644
--- a/scaffold/src/main.rs
+++ b/scaffold/src/main.rs
@@ -26,6 +26,7 @@ fn main() -> Result<()> {
         SubCommand::Token(e) => commands::token::token(&session.ok(), e, &args)?,
         SubCommand::Timer(e) => commands::timer::timer(e)?,
         SubCommand::Init(e) => commands::init::init(&session?, e, &args)?,
+        SubCommand::Submit(e) => commands::submit::submit(&session?, e, &args)?,
     }
 
     Ok(())
diff --git a/scaffold/template.txt b/scaffold/template.txt
index e95958a..5946329 100644
--- a/scaffold/template.txt
+++ b/scaffold/template.txt
@@ -15,3 +15,24 @@ impl Solution for Day{{day:pad(2)}} {
         Answer::Unimplemented
     }
 }
+
+#[cfg(test)]
+mod test {
+    use indoc::indoc;
+
+    use super::Day{{day:pad(2)}};
+
+    const CASE: &str = indoc! {"
+        ...
+    "};
+
+    #[test]
+    fn test_a() {
+        assert_eq!(Day{{day:pad(2)}}.part_a(CASE), Answer::Unimplemented);
+    }
+
+    #[test]
+    fn test_b() {
+        assert_eq!(Day{{day:pad(2)}}.part_b(CASE), Answer::Unimplemented);
+    }
+}
\ No newline at end of file
diff --git a/scaffold/todo.md b/scaffold/todo.md
index 06a8914..7cf86f3 100644
--- a/scaffold/todo.md
+++ b/scaffold/todo.md
@@ -9,4 +9,4 @@
   - [x] Verify
   - [x] Token
   - [x] Timer
-- [ ] Allow not filling the solution array
+  - [x] Submit
diff --git a/src/main.rs b/src/main.rs
index f5e412a..0777ebd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 use std::time::Instant;
 
 use clap::Parser;
-use common::Solution;
+use common::{human_time, Solution};
 
 use args::{Args, Commands};
 mod args;
@@ -67,17 +67,3 @@ fn get_year(year: u32) -> &'static [&'static dyn Solution] {
         _ => &[],
     }
 }
-
-pub fn human_time(time: u128) -> String {
-    const TIME_UNITS: &[&str] = &["ns", "μs", "ms", "s"];
-
-    let mut time = time;
-    for i in TIME_UNITS {
-        if time < 1000 {
-            return format!("{}{}", time, i);
-        }
-        time /= 1000;
-    }
-
-    format!("{}{}", time, TIME_UNITS.last().unwrap())
-}