diff --git a/src/bin/ent/main.rs b/src/bin/ent/main.rs
index af01182..5c794e5 100644
--- a/src/bin/ent/main.rs
+++ b/src/bin/ent/main.rs
@@ -129,19 +129,6 @@ fn handle_command(
                     }
                 }
 
-                if let Some(issue_done_time) = issue.done_time {
-                    if let Some(start_done_time) = filter.start_done_time {
-                        if start_done_time > issue_done_time {
-                            continue;
-                        }
-                    }
-                    if let Some(end_done_time) = filter.end_done_time {
-                        if end_done_time < issue_done_time {
-                            continue;
-                        }
-                    }
-                }
-
                 // This issue passed all the filters, include it in list.
                 uuids_by_state
                     .entry(issue.state.clone())
diff --git a/src/lib.rs b/src/lib.rs
index 3ec1ba8..17104ea 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,10 +1,10 @@
 use std::str::FromStr;
 
 pub mod comment;
-pub mod database;
 pub mod git;
 pub mod issue;
 pub mod issues;
+pub mod database;
 
 #[derive(Debug, thiserror::Error)]
 pub enum ParseFilterError {
@@ -12,8 +12,6 @@ pub enum ParseFilterError {
     ParseError,
     #[error(transparent)]
     IssueParseError(#[from] crate::issue::IssueError),
-    #[error(transparent)]
-    ChronoParseError(#[from] chrono::format::ParseError),
 }
 
 // FIXME: It's easy to imagine a full dsl for filtering issues, for now
@@ -25,8 +23,6 @@ pub struct Filter<'a> {
     pub include_assignees: std::collections::HashSet<&'a str>,
     pub include_tags: std::collections::HashSet<&'a str>,
     pub exclude_tags: std::collections::HashSet<&'a str>,
-    pub start_done_time: Option<chrono::DateTime<chrono::Local>>,
-    pub end_done_time: Option<chrono::DateTime<chrono::Local>>,
 }
 
 impl<'a> Filter<'a> {
@@ -42,11 +38,9 @@ impl<'a> Filter<'a> {
             include_assignees: std::collections::HashSet::<&'a str>::new(),
             include_tags: std::collections::HashSet::<&'a str>::new(),
             exclude_tags: std::collections::HashSet::<&'a str>::new(),
-            start_done_time: None,
-            end_done_time: None,
         };
 
-        for filter_chunk_str in filter_str.split(" ") {
+        for filter_chunk_str in filter_str.split(":") {
             let tokens: Vec<&str> = filter_chunk_str.split("=").collect();
             if tokens.len() != 2 {
                 return Err(ParseFilterError::ParseError);
@@ -82,25 +76,6 @@ impl<'a> Filter<'a> {
                     }
                 }
 
-                "done-time" => {
-                    let times: Vec<&str> = tokens[1].split("..").collect();
-                    if times.len() > 2 {
-                        return Err(ParseFilterError::ParseError);
-                    }
-                    if times[0].len() != 0 {
-                        f.start_done_time = Some(
-                            chrono::DateTime::parse_from_rfc3339(times[0])?
-                                .with_timezone(&chrono::Local),
-                        );
-                    }
-                    if times[1].len() != 0 {
-                        f.end_done_time = Some(
-                            chrono::DateTime::parse_from_rfc3339(times[1])?
-                                .with_timezone(&chrono::Local),
-                        );
-                    }
-                }
-
                 _ => {
                     println!("unknown filter chunk '{}'", filter_chunk_str);
                     return Err(ParseFilterError::ParseError);