diff --git a/src/parser/clock.rs b/src/parser/clock.rs
index 5b71e01..d15e69a 100644
--- a/src/parser/clock.rs
+++ b/src/parser/clock.rs
@@ -1,7 +1,15 @@
 use nom::branch::alt;
+use nom::bytes::complete::is_not;
+use nom::bytes::complete::tag;
 use nom::bytes::complete::tag_no_case;
+use nom::character::complete::digit1;
+use nom::character::complete::line_ending;
 use nom::character::complete::space0;
 use nom::character::complete::space1;
+use nom::combinator::eof;
+use nom::combinator::recognize;
+use nom::combinator::verify;
+use nom::sequence::tuple;
 
 use super::Context;
 use crate::error::Res;
@@ -35,10 +43,30 @@ fn inactive_timestamp_range_duration<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, &'s str> {
-    todo!()
+    recognize(tuple((
+        tag("["),
+        is_not("\r\n]"),
+        tag("]--["),
+        is_not("\r\n]"),
+        tag("]"),
+        space1,
+        tag("=>"),
+        space1,
+        digit1,
+        tag(":"),
+        verify(digit1, |mm: &str| mm.len() == 2),
+        space0,
+        alt((line_ending, eof)),
+    )))(input)
 }
 
 #[tracing::instrument(ret, level = "debug")]
 fn inactive_timestamp<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
-    todo!()
+    recognize(tuple((
+        tag("["),
+        is_not("\r\n]"),
+        tag("]"),
+        space0,
+        alt((line_ending, eof)),
+    )))(input)
 }