diff --git a/pttodoest/Cargo.lock b/pttodoest/Cargo.lock
index 4ace4f7..9ce4be4 100755
--- a/pttodoest/Cargo.lock
+++ b/pttodoest/Cargo.lock
@@ -2,6 +2,24 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddd31a130427c27518df266943a5308ed92d4b226cc639f5a8f1002816174301"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.21"
@@ -52,12 +70,53 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
+
 [[package]]
 name = "bitflags"
 version = "2.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "812e12b5285cc515a9c72a5c1d3b6d46a19dac5acfef5265968c166106e31dd3"
 
+[[package]]
+name = "bumpalo"
+version = "3.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
+
+[[package]]
+name = "cc"
+version = "1.2.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "35900b6c8d709fb1d854671ae27aeaa9eec2f8b01b364e1619a40da3e6fe2afe"
+dependencies = [
+ "find-msvc-tools",
+ "shlex",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
+
+[[package]]
+name = "chrono"
+version = "0.4.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "145052bdd345b87320e369255277e3fb5152762ad123a901ef5c262dd38fe8d2"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-link",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.51"
@@ -104,6 +163,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
+
 [[package]]
 name = "equivalent"
 version = "1.0.2"
@@ -120,6 +185,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "find-msvc-tools"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52051878f80a721bb68ebfbc930e07b65ba72f2da88968ea5c06fd6ca3d3a127"
+
 [[package]]
 name = "fuchsia-cprng"
 version = "0.1.1"
@@ -148,6 +219,30 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.64"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33e57f83510bb73707521ebaffa789ec8caf86f9657cad665b092b581d40e9fb"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "indexmap"
 version = "2.12.0"
@@ -170,6 +265,16 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
 
+[[package]]
+name = "js-sys"
+version = "0.3.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b011eec8cc36da2aab2d5cff675ec18454fad408585853910a202391cf9f8e65"
+dependencies = [
+ "once_cell",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "json-patch"
 version = "4.1.0"
@@ -204,12 +309,33 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df1d3c3b53da64cf5760482273a98e575c651a67eec7f77df96b5b642de8f039"
 
+[[package]]
+name = "log"
+version = "0.4.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34080505efa8e45a4b816c349525ebe327ceaa8559756f0356cba97ef3bf7432"
+
 [[package]]
 name = "memchr"
 version = "2.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"
 
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+
 [[package]]
 name = "once_cell_polyfill"
 version = "1.70.2"
@@ -229,10 +355,12 @@ dependencies = [
 name = "pttodoest"
 version = "0.1.0"
 dependencies = [
+ "chrono",
  "clap",
  "gethostname",
  "json-patch",
  "jsonptr",
+ "regex",
  "serde",
  "serde_json",
  "serde_yaml",
@@ -285,6 +413,35 @@ dependencies = [
  "rand_core 0.3.1",
 ]
 
+[[package]]
+name = "regex"
+version = "1.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843bc0191f75f3e22651ae5f1e72939ab2f72a4bc30fa80a066bd66edefc24d4"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5276caf25ac86c8d810222b3dbb938e512c55c6831a10f3e6ed1c93b84041f1c"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a2d987857b319362043e95f5353c0535c1f58eec5336fdfcf626430af7def58"
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.3"
@@ -307,6 +464,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
+
 [[package]]
 name = "ryu"
 version = "1.0.20"
@@ -369,6 +532,12 @@ dependencies = [
  "unsafe-libyaml",
 ]
 
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -434,6 +603,51 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da95793dfc411fbbd93f5be7715b0578ec61fe87cb1a42b12eb625caa5c5ea60"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04264334509e04a7bf8690f2384ef5265f05143a4bff3889ab7a3269adab59c2"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "420bc339d9f322e562942d52e115d57e950d12d88983a14c79b86859ee6c7ebc"
+dependencies = [
+ "bumpalo",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76f218a38c84bcb33c25ec7059b07847d465ce0e0a76b995e134a45adcb6af76"
+dependencies = [
+ "unicode-ident",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -456,12 +670,65 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows-core"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.60.2"
diff --git a/pttodoest/Cargo.toml b/pttodoest/Cargo.toml
index 9d21ef0..717855e 100755
--- a/pttodoest/Cargo.toml
+++ b/pttodoest/Cargo.toml
@@ -4,10 +4,12 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+chrono = "0.4.42"
 clap = { version = "4.5.51", features = ["derive"] }
 gethostname = "1.1.0"
 json-patch = "4.1.0"
 jsonptr = "0.7.1"
+regex = "1.12.2"
 serde = { version = "1.0.228", features = ["serde_derive"] }
 serde_json = "1.0.145"
 serde_yaml = "0.9.34"
diff --git a/pttodoest/src/main.rs b/pttodoest/src/main.rs
index 486d7bb..eb3427a 100755
--- a/pttodoest/src/main.rs
+++ b/pttodoest/src/main.rs
@@ -502,6 +502,126 @@ impl Delta {
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 struct Task(serde_yaml::Value);
 
+impl Task {
+    pub fn next_due(&self) -> Option<u64> {
+        match self.schedule() {
+            Some(schedule) => self.parse_schedule_next(schedule),
+            None => Some(1),
+        }
+    }
+
+    fn parse_schedule_next(&self, schedule: String) -> Option<u64> {
+        let mut schedule = schedule;
+
+        if regex::Regex::new(r"^[0-9]+h$").unwrap().is_match(&schedule) {
+            let hours = &schedule[..schedule.len() - 1];
+            match hours.parse::<u64>() {
+                Ok(hours) => return Some(Delta::now_time() + hours * 60 * 60),
+                _ => {}
+            };
+        }
+
+        if regex::Regex::new(r"[0-9]{4}-[0-9]{2}-[0-9]{2}$")
+            .unwrap()
+            .is_match(&schedule)
+        {
+            schedule += "T00";
+        }
+
+        eprintln!("0 PARSING DATE HOUR {}", &schedule);
+        if regex::Regex::new(r"[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}$")
+            .unwrap()
+            .is_match(&schedule)
+        {
+            eprintln!("1 PARSING DATE HOUR {} like %Y-%m-%dT%H", &schedule);
+            let date = schedule.clone() + ":00:00";
+            match chrono::NaiveDateTime::parse_from_str(&date, "%Y-%m-%dT%H:%M:%S") {
+                Ok(datehour) => {
+                    eprintln!("2 PARSING DATE HOUR {}", &schedule);
+                    let seconds = datehour.format("%s").to_string();
+                    match seconds.parse::<u64>() {
+                        Ok(n) => return Some(n),
+                        _ => {}
+                    };
+                }
+                Err(msg) => panic!("{}", msg),
+            };
+        }
+
+        None
+    }
+
+    fn schedule(&self) -> Option<String> {
+        match &self.0 {
+            serde_yaml::Value::Mapping(m) => match m.get("schedule".to_string()) {
+                Some(schedule) => match schedule {
+                    serde_yaml::Value::String(s) => Some(s.clone()),
+                    _ => None,
+                },
+                _ => None,
+            },
+            _ => None,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test_task {
+    use super::*;
+
+    #[test]
+    fn test_unscheduled() {
+        let task = Task(serde_yaml::Value::String("hello world".to_string()));
+        assert_eq!(None, task.schedule());
+        assert_eq!(Some(1 as u64), task.next_due());
+    }
+
+    #[test]
+    fn test_scheduled_date_before() {
+        let mut m = serde_yaml::Mapping::new();
+        m.insert("schedule".into(), "2006-01-02".into());
+        let task = Task(serde_yaml::Value::Mapping(m));
+        assert_eq!(Some("2006-01-02".to_string()), task.schedule());
+        assert_eq!(Some(1136160000 as u64), task.next_due());
+    }
+
+    #[test]
+    fn test_scheduled_date_after() {
+        let mut m = serde_yaml::Mapping::new();
+        m.insert("schedule".into(), "2036-01-02".into());
+        let task = Task(serde_yaml::Value::Mapping(m));
+        assert_eq!(Some("2036-01-02".to_string()), task.schedule());
+        assert_eq!(Some(2082844800 as u64), task.next_due());
+    }
+
+    #[test]
+    fn test_scheduled_hour_after() {
+        let mut m = serde_yaml::Mapping::new();
+        m.insert("schedule".into(), "2036-01-02T16".into());
+        let task = Task(serde_yaml::Value::Mapping(m));
+        assert_eq!(Some("2036-01-02T16".to_string()), task.schedule());
+        assert_eq!(Some(2082902400 as u64), task.next_due());
+    }
+
+    #[test]
+    fn test_scheduled_duration() {
+        let mut m = serde_yaml::Mapping::new();
+        m.insert("schedule".into(), "1h".into());
+        let task = Task(serde_yaml::Value::Mapping(m));
+        assert_eq!(Some("1h".to_string()), task.schedule());
+        assert_eq!(Some(Delta::now_time() + 60 * 60 as u64), task.next_due());
+    }
+
+    #[test]
+    fn test_scheduled_cron() {
+        let mut m = serde_yaml::Mapping::new();
+        m.insert("schedule".into(), "* * * * *".into());
+        let task = Task(serde_yaml::Value::Mapping(m));
+        assert_eq!(Some("* * * * *".to_string()), task.schedule());
+        assert_eq!(Some((Delta::now_time()) + 60 % 60 as u64), task.next_due());
+    }
+}
+
 #[derive(Debug, Clone)]
 struct Events(Vec<Delta>);