diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index ad26e6432..40134830a 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -2105,6 +2105,17 @@ dependencies = [
  "tokio-rustls 0.26.0",
 ]
 
+[[package]]
+name = "nasl-builtin-isotime"
+version = "0.1.0"
+dependencies = [
+ "chrono",
+ "nasl-builtin-utils",
+ "nasl-function-proc-macro",
+ "nasl-interpreter",
+ "nasl-syntax",
+]
+
 [[package]]
 name = "nasl-builtin-knowledge-base"
 version = "0.1.0"
@@ -2199,6 +2210,7 @@ dependencies = [
  "nasl-builtin-description",
  "nasl-builtin-host",
  "nasl-builtin-http",
+ "nasl-builtin-isotime",
  "nasl-builtin-knowledge-base",
  "nasl-builtin-misc",
  "nasl-builtin-network",
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 9c3fea5fd..6aff1f507 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -4,6 +4,7 @@ members = [
   "nasl-builtin-knowledge-base",
   "nasl-builtin-raw-ip",
   "nasl-builtin-cryptographic",
+  "nasl-builtin-isotime",
   "nasl-builtin-ssh",
   "nasl-builtin-http",
   "nasl-builtin-host",
diff --git a/rust/nasl-builtin-isotime/Cargo.toml b/rust/nasl-builtin-isotime/Cargo.toml
new file mode 100644
index 000000000..2fca2cc99
--- /dev/null
+++ b/rust/nasl-builtin-isotime/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "nasl-builtin-isotime"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nasl-builtin-utils = { path = "../nasl-builtin-utils" }
+nasl-function-proc-macro = { path = "../nasl-function-proc-macro" }
+nasl-syntax = { path = "../nasl-syntax" }
+
+chrono = "0.4.23"
+
+[dev-dependencies]
+nasl-interpreter = { path = "../nasl-interpreter" }
diff --git a/rust/nasl-builtin-isotime/README.md b/rust/nasl-builtin-isotime/README.md
new file mode 100644
index 000000000..9558df1db
--- /dev/null
+++ b/rust/nasl-builtin-isotime/README.md
@@ -0,0 +1,7 @@
+## Implements
+
+- isotime_add
+- isotime_is_valid
+- isotime_now
+- isotime_print
+- isotime_scan
diff --git a/rust/nasl-builtin-isotime/src/lib.rs b/rust/nasl-builtin-isotime/src/lib.rs
new file mode 100644
index 000000000..a5d77a536
--- /dev/null
+++ b/rust/nasl-builtin-isotime/src/lib.rs
@@ -0,0 +1,130 @@
+// SPDX-FileCopyrightText: 2023 Greenbone AG
+//
+// SPDX-License-Identifier: GPL-2.0-or-later WITH x11vnc-openssl-exception
+
+//! Defines NASL functions regarding isotime.
+
+use chrono::{Datelike, Months, NaiveDate, NaiveDateTime, TimeDelta};
+use nasl_builtin_utils::{function_set, FunctionErrorKind};
+use nasl_function_proc_macro::nasl_function;
+
+const ISOFORMAT: &str = "yyyymmddThhmmss";
+const READABLEFORMAT: &str = "yyyy-mm-dd hh:mm:ss";
+
+fn parse_isotime(time: &str) -> Option<NaiveDateTime> {
+    NaiveDateTime::parse_from_str(time, "%Y%m%dT%H%M%S").ok()
+}
+
+fn parse_readable_time(time: &str) -> Option<NaiveDateTime> {
+    if let Ok(time) = NaiveDateTime::parse_from_str(time, "%Y-%m-%d %H:%M:%S") {
+        return Some(time);
+    }
+    if let Ok(time) = NaiveDateTime::parse_from_str(time, "%Y-%m-%d %H:%M") {
+        return Some(time);
+    }
+    if let Some((date, hours)) = time.split_once(" ") {
+        if let Ok(date) = NaiveDate::parse_from_str(date, "%Y-%m-%d") {
+            if let Ok(hours) = hours.parse::<u32>() {
+                if let Some(time) = date.and_hms_opt(hours, 0, 0) {
+                    return Some(time);
+                }
+            }
+        }
+    }
+    if let Ok(date) = NaiveDate::parse_from_str(time, "%Y-%m-%d") {
+        // Cannot fail, since we add no time to the date
+        return Some(date.and_hms_opt(0, 0, 0).unwrap());
+    }
+
+    None
+}
+
+fn parse_time(time: &str) -> Result<NaiveDateTime, FunctionErrorKind> {
+    if let Some(time) = parse_isotime(time) {
+        return Ok(time);
+    }
+    if let Some(time) = parse_readable_time(time) {
+        return Ok(time);
+    }
+    Err(FunctionErrorKind::Diagnostic(
+        format!(
+            "The given time is not in the correct isotime ({}) or readable time format ({}): {}",
+            ISOFORMAT, READABLEFORMAT, time
+        ),
+        None,
+    ))
+}
+
+#[nasl_function(named(years, days, seconds))]
+fn isotime_add(
+    time: &str,
+    years: Option<i64>,
+    days: Option<i64>,
+    seconds: Option<i64>,
+) -> Result<String, FunctionErrorKind> {
+    let mut time = parse_time(time)?;
+
+    if let Some(years) = years {
+        if years < 0 {
+            time = time - Months::new((-years) as u32 * 12);
+        } else {
+            time = time + Months::new(years as u32 * 12);
+        }
+    }
+
+    if let Some(days) = days {
+        time += TimeDelta::days(days);
+    }
+
+    if let Some(seconds) = seconds {
+        time += TimeDelta::seconds(seconds);
+    }
+
+    if time.year() < 0 || time.year() > 9999 {
+        return Err(FunctionErrorKind::Diagnostic(
+            format!(
+                "The resulting year is out of range (0000-9999): {}.",
+                time.year()
+            ),
+            None,
+        ));
+    }
+
+    Ok(time.format("%Y%m%dT%H%M%S").to_string())
+}
+
+#[nasl_function]
+fn isotime_is_valid(time: &str) -> bool {
+    parse_time(time).is_ok()
+}
+
+#[nasl_function]
+fn isotime_now() -> String {
+    chrono::Utc::now().format("%Y%m%dT%H%M%S").to_string()
+}
+
+#[nasl_function]
+fn isotime_print(time: &str) -> Result<String, FunctionErrorKind> {
+    Ok(parse_time(time)?.format("%Y-%m-%d %H:%M:%S").to_string())
+}
+
+#[nasl_function]
+fn isotime_scan(time: &str) -> Result<String, FunctionErrorKind> {
+    let time = parse_time(time)?;
+
+    Ok(time.format("%Y%m%dT%H%M%S").to_string())
+}
+
+pub struct NaslIsotime;
+
+function_set! {
+    NaslIsotime,
+    sync_stateless,
+    (
+        isotime_add,
+        isotime_is_valid,
+        isotime_now,
+        isotime_print,
+        isotime_scan
+    )
+}
diff --git a/rust/nasl-builtin-isotime/tests/isotime.rs b/rust/nasl-builtin-isotime/tests/isotime.rs
new file mode 100644
index 000000000..3e0eeec5b
--- /dev/null
+++ b/rust/nasl-builtin-isotime/tests/isotime.rs
@@ -0,0 +1,121 @@
+// SPDX-FileCopyrightText: 2023 Greenbone AG
+//
+// SPDX-License-Identifier: GPL-2.0-or-later WITH x11vnc-openssl-exception
+#[cfg(test)]
+mod tests {
+    use nasl_interpreter::{check_err_matches, test_utils::check_code_result, FunctionErrorKind};
+
+    #[test]
+    fn isotime_is_valid() {
+        check_code_result("isotime_is_valid(\"\");", false);
+        check_code_result("isotime_is_valid(\"a8691002T123456\");", false);
+        check_code_result("isotime_is_valid(\"18691002T123456\");", true);
+        check_code_result("isotime_is_valid(\"18691002T1234\");", false);
+        check_code_result("isotime_is_valid(\"18691002T1234512\");", false);
+        check_code_result("isotime_is_valid(\"1869-10-02 12:34:56\");", true);
+        check_code_result("isotime_is_valid(\"1869-10-02 12:34\");", true);
+        check_code_result("isotime_is_valid(\"1869-10-02 12\");", true);
+        check_code_result("isotime_is_valid(\"1869-10-02\");", true);
+        check_code_result("isotime_is_valid(\"1869-10-02T12:34:56\");", false);
+    }
+
+    #[test]
+    fn isotime_scan() {
+        check_err_matches!("isotime_scan(\"\");", FunctionErrorKind::Diagnostic { .. });
+        check_err_matches!(
+            "isotime_scan(\"a8691002T123456\");",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+        check_err_matches!(
+            "isotime_scan(\"18691002T1234\");",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+        check_err_matches!(
+            "isotime_scan(\"18691002T1234512\");",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+        check_err_matches!(
+            "isotime_scan(\"1869-10-02T12:34:56\");",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+
+        check_code_result("isotime_scan(\"18691002T123456\");", "18691002T123456");
+        check_code_result("isotime_scan(\"1869-10-02 12:34:56\");", "18691002T123456");
+        check_code_result("isotime_scan(\"1869-10-02 12:34\");", "18691002T123400");
+        check_code_result("isotime_scan(\"1869-10-02 12\");", "18691002T120000");
+    }
+
+    #[test]
+    fn isotime_print() {
+        check_err_matches!("isotime_print(\"\");", FunctionErrorKind::Diagnostic { .. });
+        check_err_matches!(
+            "isotime_print(\"a8691002T123456\");",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+        check_err_matches!(
+            "isotime_print(\"18691002T1234\");",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+        check_err_matches!(
+            "isotime_print(\"1869-10-02T12:34:56\");",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+
+        check_code_result("isotime_print(\"18691002T123456\");", "1869-10-02 12:34:56");
+        check_code_result("isotime_print(\"18691002T123451\");", "1869-10-02 12:34:51");
+        check_code_result(
+            "isotime_print(\"1869-10-02 12:34:56\");",
+            "1869-10-02 12:34:56",
+        );
+        check_code_result(
+            "isotime_print(\"1869-10-02 12:34\");",
+            "1869-10-02 12:34:00",
+        );
+        check_code_result("isotime_print(\"1869-10-02 12\");", "1869-10-02 12:00:00");
+    }
+
+    #[test]
+    fn isotime_add() {
+        check_err_matches!(
+            "isotime_add(\"\", years: 0);",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+        check_err_matches!(
+            "isotime_add(\"50001002T120000\", years: 5000);",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+        check_err_matches!(
+            "isotime_add(\"50001002T120000\", years: -5001);",
+            FunctionErrorKind::Diagnostic { .. }
+        );
+
+        check_code_result(
+            "isotime_add(\"20240228T000000\", days: 1);",
+            "20240229T000000",
+        );
+        check_code_result(
+            "isotime_add(\"20240228T000000\", years: 1);",
+            "20250228T000000",
+        );
+        check_code_result(
+            "isotime_add(\"20240228T000000\", seconds: 1);",
+            "20240228T000001",
+        );
+        check_code_result(
+            "isotime_add(\"20240228T000000\", days: -1);",
+            "20240227T000000",
+        );
+        check_code_result(
+            "isotime_add(\"20240228T000000\", years: -1);",
+            "20230228T000000",
+        );
+        check_code_result(
+            "isotime_add(\"20240228T000000\", seconds: -1);",
+            "20240227T235959",
+        );
+        check_code_result(
+            "isotime_add(\"20240228T000000\", years: 1, days: -1, seconds: -1);",
+            "20250226T235959",
+        );
+    }
+}
diff --git a/rust/nasl-builtin-std/Cargo.toml b/rust/nasl-builtin-std/Cargo.toml
index 79fd7ade0..ede35f31b 100644
--- a/rust/nasl-builtin-std/Cargo.toml
+++ b/rust/nasl-builtin-std/Cargo.toml
@@ -16,6 +16,7 @@ nasl-builtin-description = { path = "../nasl-builtin-description" }
 nasl-builtin-network = { path = "../nasl-builtin-network" }
 nasl-builtin-misc = { path = "../nasl-builtin-misc" }
 nasl-builtin-regex = { path = "../nasl-builtin-regex" }
+nasl-builtin-isotime = { path = "../nasl-builtin-isotime" }
 nasl-function-proc-macro = { path = "../nasl-function-proc-macro" }
 storage = { path = "../storage" }
 models = { path = "../models" }
diff --git a/rust/nasl-builtin-std/src/lib.rs b/rust/nasl-builtin-std/src/lib.rs
index a0e81f9d3..40eb7e43d 100644
--- a/rust/nasl-builtin-std/src/lib.rs
+++ b/rust/nasl-builtin-std/src/lib.rs
@@ -30,7 +30,8 @@ pub fn nasl_std_functions() -> Executor {
         .add_set(nasl_builtin_network::network::Network)
         .add_set(nasl_builtin_regex::RegularExpressions)
         .add_set(nasl_builtin_cryptographic::Cryptographic)
-        .add_set(nasl_builtin_description::Description);
+        .add_set(nasl_builtin_description::Description)
+        .add_set(nasl_builtin_isotime::NaslIsotime);
 
     #[cfg(feature = "nasl-builtin-ssh")]
     executor.add_set(nasl_builtin_ssh::Ssh::default());