diff --git a/Cargo.toml b/Cargo.toml
index a2b2554376..c2e058ad92 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,14 +23,13 @@ libc = []
 winapi = ["windows-targets"]
 std = []
 clock = ["std", "winapi", "iana-time-zone", "android-tzdata"]
-oldtime = ["time"]
+oldtime = []
 wasmbind = ["wasm-bindgen", "js-sys"]
 unstable-locales = ["pure-rust-locales", "alloc"]
 __internal_bench = []
 __doctest = []
 
 [dependencies]
-time = { version = "0.1.43", optional = true }
 num-traits = { version = "0.2", default-features = false }
 rustc-serialize = { version = "0.3.20", optional = true }
 serde = { version = "1.0.99", default-features = false, optional = true }
diff --git a/README.md b/README.md
index dde079804e..c3222ddaa3 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,6 @@ Optional features:
 * `serde`: Enable serialization/deserialization via serde.
 * `rkyv`: Enable serialization/deserialization via rkyv.
 * `rustc-serialize`: Enable serialization/deserialization via rustc-serialize (deprecated).
-* `old_time`: compatability with the `Duration` type of the `time` 0.1 crate (deprecated).
 * `arbitrary`: construct arbitrary instances of a type with the Arbitrary crate.
 * `unstable-locales`: Enable localization. This adds various methods with a `_localized` suffix.
   The implementation and API may change or even be removed in a patch release. Feedback welcome.
diff --git a/src/date.rs b/src/date.rs
index 15f3d436d1..5e84692370 100644
--- a/src/date.rs
+++ b/src/date.rs
@@ -13,13 +13,13 @@ use core::{fmt, hash};
 #[cfg(feature = "rkyv")]
 use rkyv::{Archive, Deserialize, Serialize};
 
+use crate::duration::Duration as OldDuration;
 #[cfg(feature = "unstable-locales")]
 use crate::format::Locale;
 #[cfg(any(feature = "alloc", feature = "std"))]
 use crate::format::{DelayedFormat, Item, StrftimeItems};
 use crate::naive::{IsoWeek, NaiveDate, NaiveTime};
 use crate::offset::{TimeZone, Utc};
-use crate::oldtime::Duration as OldDuration;
 use crate::DateTime;
 use crate::{Datelike, Weekday};
 
@@ -576,7 +576,7 @@ where
 mod tests {
     use super::Date;
 
-    use crate::oldtime::Duration;
+    use crate::duration::Duration;
     use crate::{FixedOffset, NaiveDate, Utc};
 
     #[cfg(feature = "clock")]
diff --git a/src/datetime/mod.rs b/src/datetime/mod.rs
index ec6ed4fe0e..650c63d0c0 100644
--- a/src/datetime/mod.rs
+++ b/src/datetime/mod.rs
@@ -14,6 +14,7 @@ use core::{fmt, hash, str};
 #[cfg(feature = "std")]
 use std::time::{SystemTime, UNIX_EPOCH};
 
+use crate::duration::Duration as OldDuration;
 #[cfg(feature = "unstable-locales")]
 use crate::format::Locale;
 use crate::format::{
@@ -26,7 +27,6 @@ use crate::naive::{Days, IsoWeek, NaiveDate, NaiveDateTime, NaiveTime};
 #[cfg(feature = "clock")]
 use crate::offset::Local;
 use crate::offset::{FixedOffset, Offset, TimeZone, Utc};
-use crate::oldtime::Duration as OldDuration;
 #[allow(deprecated)]
 use crate::Date;
 use crate::{Datelike, Months, Timelike, Weekday};
diff --git a/src/datetime/tests.rs b/src/datetime/tests.rs
index 53d46682e8..cf24cb4963 100644
--- a/src/datetime/tests.rs
+++ b/src/datetime/tests.rs
@@ -1,9 +1,9 @@
 use super::DateTime;
+use crate::duration::Duration as OldDuration;
 use crate::naive::{NaiveDate, NaiveTime};
 use crate::offset::{FixedOffset, TimeZone, Utc};
 #[cfg(feature = "clock")]
 use crate::offset::{Local, Offset};
-use crate::oldtime::Duration as OldDuration;
 use crate::{Datelike, Days, LocalResult, Months, NaiveDateTime, Timelike};
 
 #[derive(Clone)]
diff --git a/src/oldtime.rs b/src/duration.rs
similarity index 92%
rename from src/oldtime.rs
rename to src/duration.rs
index 64ade7be6a..296c071093 100644
--- a/src/oldtime.rs
+++ b/src/duration.rs
@@ -22,11 +22,11 @@ use rkyv::{Archive, Deserialize, Serialize};
 /// The number of nanoseconds in a microsecond.
 const NANOS_PER_MICRO: i32 = 1000;
 /// The number of nanoseconds in a millisecond.
-const NANOS_PER_MILLI: i32 = 1000_000;
+const NANOS_PER_MILLI: i32 = 1_000_000;
 /// The number of nanoseconds in seconds.
 const NANOS_PER_SEC: i32 = 1_000_000_000;
 /// The number of microseconds per second.
-const MICROS_PER_SEC: i64 = 1000_000;
+const MICROS_PER_SEC: i64 = 1_000_000;
 /// The number of milliseconds per second.
 const MILLIS_PER_SEC: i64 = 1000;
 /// The number of seconds in a minute.
@@ -34,9 +34,9 @@ const SECS_PER_MINUTE: i64 = 60;
 /// The number of seconds in an hour.
 const SECS_PER_HOUR: i64 = 3600;
 /// The number of (non-leap) seconds in days.
-const SECS_PER_DAY: i64 = 86400;
+const SECS_PER_DAY: i64 = 86_400;
 /// The number of (non-leap) seconds in a week.
-const SECS_PER_WEEK: i64 = 604800;
+const SECS_PER_WEEK: i64 = 604_800;
 
 macro_rules! try_opt {
     ($e:expr) => {
@@ -128,7 +128,7 @@ impl Duration {
     pub const fn milliseconds(milliseconds: i64) -> Duration {
         let (secs, millis) = div_mod_floor_64(milliseconds, MILLIS_PER_SEC);
         let nanos = millis as i32 * NANOS_PER_MILLI;
-        Duration { secs: secs, nanos: nanos }
+        Duration { secs, nanos }
     }
 
     /// Makes a new `Duration` with given number of microseconds.
@@ -136,14 +136,14 @@ impl Duration {
     pub const fn microseconds(microseconds: i64) -> Duration {
         let (secs, micros) = div_mod_floor_64(microseconds, MICROS_PER_SEC);
         let nanos = micros as i32 * NANOS_PER_MICRO;
-        Duration { secs: secs, nanos: nanos }
+        Duration { secs, nanos }
     }
 
     /// Makes a new `Duration` with given number of nanoseconds.
     #[inline]
     pub const fn nanoseconds(nanos: i64) -> Duration {
         let (secs, nanos) = div_mod_floor_64(nanos, NANOS_PER_SEC as i64);
-        Duration { secs: secs, nanos: nanos as i32 }
+        Duration { secs, nanos: nanos as i32 }
     }
 
     /// Returns the total number of whole weeks in the duration.
@@ -224,7 +224,7 @@ impl Duration {
             nanos -= NANOS_PER_SEC;
             secs = try_opt!(secs.checked_add(1));
         }
-        let d = Duration { secs: secs, nanos: nanos };
+        let d = Duration { secs, nanos };
         // Even if d is within the bounds of i64 seconds,
         // it might still overflow i64 milliseconds.
         if d < MIN || d > MAX {
@@ -243,7 +243,7 @@ impl Duration {
             nanos += NANOS_PER_SEC;
             secs = try_opt!(secs.checked_sub(1));
         }
-        let d = Duration { secs: secs, nanos: nanos };
+        let d = Duration { secs, nanos };
         // Even if d is within the bounds of i64 seconds,
         // it might still overflow i64 milliseconds.
         if d < MIN || d > MAX {
@@ -338,7 +338,7 @@ impl Add for Duration {
             nanos -= NANOS_PER_SEC;
             secs += 1;
         }
-        Duration { secs: secs, nanos: nanos }
+        Duration { secs, nanos }
     }
 }
 
@@ -352,7 +352,7 @@ impl Sub for Duration {
             nanos += NANOS_PER_SEC;
             secs -= 1;
         }
-        Duration { secs: secs, nanos: nanos }
+        Duration { secs, nanos }
     }
 }
 
@@ -364,7 +364,7 @@ impl Mul<i32> for Duration {
         let total_nanos = self.nanos as i64 * rhs as i64;
         let (extra_secs, nanos) = div_mod_floor_64(total_nanos, NANOS_PER_SEC as i64);
         let secs = self.secs * rhs as i64 + extra_secs;
-        Duration { secs: secs, nanos: nanos as i32 }
+        Duration { secs, nanos: nanos as i32 }
     }
 }
 
@@ -384,7 +384,7 @@ impl Div<i32> for Duration {
             nanos += NANOS_PER_SEC;
             secs -= 1;
         }
-        Duration { secs: secs, nanos: nanos }
+        Duration { secs, nanos }
     }
 }
 
@@ -491,19 +491,19 @@ mod tests {
         assert!(Duration::seconds(1) != Duration::zero());
         assert_eq!(Duration::seconds(1) + Duration::seconds(2), Duration::seconds(3));
         assert_eq!(
-            Duration::seconds(86399) + Duration::seconds(4),
+            Duration::seconds(86_399) + Duration::seconds(4),
             Duration::days(1) + Duration::seconds(3)
         );
-        assert_eq!(Duration::days(10) - Duration::seconds(1000), Duration::seconds(863000));
-        assert_eq!(Duration::days(10) - Duration::seconds(1000000), Duration::seconds(-136000));
+        assert_eq!(Duration::days(10) - Duration::seconds(1000), Duration::seconds(863_000));
+        assert_eq!(Duration::days(10) - Duration::seconds(1_000_000), Duration::seconds(-136_000));
         assert_eq!(
-            Duration::days(2) + Duration::seconds(86399) + Duration::nanoseconds(1234567890),
-            Duration::days(3) + Duration::nanoseconds(234567890)
+            Duration::days(2) + Duration::seconds(86_399) + Duration::nanoseconds(1_234_567_890),
+            Duration::days(3) + Duration::nanoseconds(234_567_890)
         );
         assert_eq!(-Duration::days(3), Duration::days(-3));
         assert_eq!(
             -(Duration::days(3) + Duration::seconds(70)),
-            Duration::days(-4) + Duration::seconds(86400 - 70)
+            Duration::days(-4) + Duration::seconds(86_400 - 70)
         );
     }
 
@@ -512,10 +512,10 @@ mod tests {
         assert_eq!(Duration::zero().num_days(), 0);
         assert_eq!(Duration::days(1).num_days(), 1);
         assert_eq!(Duration::days(-1).num_days(), -1);
-        assert_eq!(Duration::seconds(86399).num_days(), 0);
-        assert_eq!(Duration::seconds(86401).num_days(), 1);
-        assert_eq!(Duration::seconds(-86399).num_days(), 0);
-        assert_eq!(Duration::seconds(-86401).num_days(), -1);
+        assert_eq!(Duration::seconds(86_399).num_days(), 0);
+        assert_eq!(Duration::seconds(86_401).num_days(), 1);
+        assert_eq!(Duration::seconds(-86_399).num_days(), 0);
+        assert_eq!(Duration::seconds(-86_401).num_days(), -1);
         assert_eq!(Duration::days(i32::MAX as i64).num_days(), i32::MAX as i64);
         assert_eq!(Duration::days(i32::MIN as i64).num_days(), i32::MIN as i64);
     }
@@ -561,7 +561,7 @@ mod tests {
         assert_eq!(MIN.num_microseconds(), None);
 
         // overflow checks
-        const MICROS_PER_DAY: i64 = 86400_000_000;
+        const MICROS_PER_DAY: i64 = 86_400_000_000;
         assert_eq!(
             Duration::days(i64::MAX / MICROS_PER_DAY).num_microseconds(),
             Some(i64::MAX / MICROS_PER_DAY * MICROS_PER_DAY)
@@ -585,7 +585,7 @@ mod tests {
         assert_eq!(MIN.num_nanoseconds(), None);
 
         // overflow checks
-        const NANOS_PER_DAY: i64 = 86400_000_000_000;
+        const NANOS_PER_DAY: i64 = 86_400_000_000_000;
         assert_eq!(
             Duration::days(i64::MAX / NANOS_PER_DAY).num_nanoseconds(),
             Some(i64::MAX / NANOS_PER_DAY * NANOS_PER_DAY)
@@ -629,6 +629,7 @@ mod tests {
     }
 
     #[test]
+    #[allow(clippy::erasing_op)]
     fn test_duration_mul() {
         assert_eq!(Duration::zero() * i32::MAX, Duration::zero());
         assert_eq!(Duration::zero() * i32::MIN, Duration::zero());
@@ -693,7 +694,7 @@ mod tests {
         assert_eq!(Duration::microseconds(42).to_string(), "PT0.000042S");
         assert_eq!(Duration::nanoseconds(42).to_string(), "PT0.000000042S");
         assert_eq!((Duration::days(7) + Duration::milliseconds(6543)).to_string(), "P7DT6.543S");
-        assert_eq!(Duration::seconds(-86401).to_string(), "-P1DT1S");
+        assert_eq!(Duration::seconds(-86_401).to_string(), "-P1DT1S");
         assert_eq!(Duration::nanoseconds(-1).to_string(), "-PT0.000000001S");
 
         // the format specifier should have no effect on `Duration`
@@ -706,11 +707,14 @@ mod tests {
     #[test]
     fn test_to_std() {
         assert_eq!(Duration::seconds(1).to_std(), Ok(StdDuration::new(1, 0)));
-        assert_eq!(Duration::seconds(86401).to_std(), Ok(StdDuration::new(86401, 0)));
-        assert_eq!(Duration::milliseconds(123).to_std(), Ok(StdDuration::new(0, 123000000)));
-        assert_eq!(Duration::milliseconds(123765).to_std(), Ok(StdDuration::new(123, 765000000)));
+        assert_eq!(Duration::seconds(86_401).to_std(), Ok(StdDuration::new(86_401, 0)));
+        assert_eq!(Duration::milliseconds(123).to_std(), Ok(StdDuration::new(0, 123_000_000)));
+        assert_eq!(
+            Duration::milliseconds(123_765).to_std(),
+            Ok(StdDuration::new(123, 765_000_000))
+        );
         assert_eq!(Duration::nanoseconds(777).to_std(), Ok(StdDuration::new(0, 777)));
-        assert_eq!(MAX.to_std(), Ok(StdDuration::new(9223372036854775, 807000000)));
+        assert_eq!(MAX.to_std(), Ok(StdDuration::new(9_223_372_036_854_775, 807_000_000)));
         assert_eq!(Duration::seconds(-1).to_std(), Err(OutOfRangeError(())));
         assert_eq!(Duration::milliseconds(-1).to_std(), Err(OutOfRangeError(())));
     }
@@ -718,23 +722,26 @@ mod tests {
     #[test]
     fn test_from_std() {
         assert_eq!(Ok(Duration::seconds(1)), Duration::from_std(StdDuration::new(1, 0)));
-        assert_eq!(Ok(Duration::seconds(86401)), Duration::from_std(StdDuration::new(86401, 0)));
+        assert_eq!(Ok(Duration::seconds(86_401)), Duration::from_std(StdDuration::new(86_401, 0)));
         assert_eq!(
             Ok(Duration::milliseconds(123)),
-            Duration::from_std(StdDuration::new(0, 123000000))
+            Duration::from_std(StdDuration::new(0, 123_000_000))
         );
         assert_eq!(
-            Ok(Duration::milliseconds(123765)),
-            Duration::from_std(StdDuration::new(123, 765000000))
+            Ok(Duration::milliseconds(123_765)),
+            Duration::from_std(StdDuration::new(123, 765_000_000))
         );
         assert_eq!(Ok(Duration::nanoseconds(777)), Duration::from_std(StdDuration::new(0, 777)));
-        assert_eq!(Ok(MAX), Duration::from_std(StdDuration::new(9223372036854775, 807000000)));
         assert_eq!(
-            Duration::from_std(StdDuration::new(9223372036854776, 0)),
+            Ok(MAX),
+            Duration::from_std(StdDuration::new(9_223_372_036_854_775, 807_000_000))
+        );
+        assert_eq!(
+            Duration::from_std(StdDuration::new(9_223_372_036_854_776, 0)),
             Err(OutOfRangeError(()))
         );
         assert_eq!(
-            Duration::from_std(StdDuration::new(9223372036854775, 807000001)),
+            Duration::from_std(StdDuration::new(9_223_372_036_854_775, 807_000_001)),
             Err(OutOfRangeError(()))
         );
     }
diff --git a/src/format/parsed.rs b/src/format/parsed.rs
index 431833ec7d..ad0d0013a3 100644
--- a/src/format/parsed.rs
+++ b/src/format/parsed.rs
@@ -5,9 +5,9 @@
 //! They can be constructed incrementally while being checked for consistency.
 
 use super::{ParseResult, IMPOSSIBLE, NOT_ENOUGH, OUT_OF_RANGE};
+use crate::duration::Duration as OldDuration;
 use crate::naive::{NaiveDate, NaiveDateTime, NaiveTime};
 use crate::offset::{FixedOffset, LocalResult, Offset, TimeZone};
-use crate::oldtime::Duration as OldDuration;
 use crate::{DateTime, Datelike, Timelike, Weekday};
 
 /// Parsed parts of date and time. There are two classes of methods:
diff --git a/src/lib.rs b/src/lib.rs
index 3bcb789400..66368d9407 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -40,6 +40,8 @@
 //! - `unstable-locales`: Enable localization. This adds various methods with a
 //!   `_localized` suffix. The implementation and API may change or even be
 //!   removed in a patch release. Feedback welcome.
+//! - `oldtime`: this feature no langer has a function, but once offered compatibility with the
+//!   `time` 0.1 crate.
 //!
 //! [`serde`]: https://github.com/serde-rs/serde
 //! [wasm-bindgen]: https://github.com/rustwasm/wasm-bindgen
@@ -60,14 +62,6 @@
 //! nanoseconds and does not represent "nominal" components such as days or
 //! months.
 //!
-//! When the `oldtime` feature is enabled, [`Duration`] is an alias for the
-//! [`time::Duration`](https://docs.rs/time/0.1.40/time/struct.Duration.html)
-//! type from v0.1 of the time crate. time v0.1 is deprecated, so new code
-//! should disable the `oldtime` feature and use the `chrono::Duration` type
-//! instead. The `oldtime` feature is enabled by default for backwards
-//! compatibility, but future versions of Chrono are likely to remove the
-//! feature entirely.
-//!
 //! Chrono does not yet natively support
 //! the standard [`Duration`](https://doc.rust-lang.org/std/time/struct.Duration.html) type,
 //! but it will be supported in the future.
@@ -385,15 +379,10 @@
 #[cfg(feature = "alloc")]
 extern crate alloc;
 
-#[cfg(feature = "oldtime")]
-#[cfg_attr(docsrs, doc(cfg(feature = "oldtime")))]
-extern crate time as oldtime;
-#[cfg(not(feature = "oldtime"))]
-mod oldtime;
-// this reexport is to aid the transition and should not be in the prelude!
-pub use oldtime::Duration;
+mod duration;
+pub use duration::Duration;
 #[cfg(feature = "std")]
-pub use oldtime::OutOfRangeError;
+pub use duration::OutOfRangeError;
 
 use core::fmt;
 
diff --git a/src/naive/date.rs b/src/naive/date.rs
index 53d698e3b1..860593498d 100644
--- a/src/naive/date.rs
+++ b/src/naive/date.rs
@@ -16,6 +16,7 @@ use rkyv::{Archive, Deserialize, Serialize};
 #[cfg(feature = "unstable-locales")]
 use pure_rust_locales::Locale;
 
+use crate::duration::Duration as OldDuration;
 #[cfg(any(feature = "alloc", feature = "std"))]
 use crate::format::DelayedFormat;
 use crate::format::{
@@ -24,7 +25,6 @@ use crate::format::{
 };
 use crate::month::Months;
 use crate::naive::{IsoWeek, NaiveDateTime, NaiveTime};
-use crate::oldtime::Duration as OldDuration;
 use crate::{expect, try_opt};
 use crate::{Datelike, Weekday};
 
@@ -2390,7 +2390,7 @@ mod serde {
 #[cfg(test)]
 mod tests {
     use super::{Days, Months, NaiveDate, MAX_YEAR, MIN_YEAR};
-    use crate::oldtime::Duration;
+    use crate::duration::Duration;
     use crate::{Datelike, Weekday};
 
     // as it is hard to verify year flags in `NaiveDate::MIN` and `NaiveDate::MAX`,
diff --git a/src/naive/datetime/mod.rs b/src/naive/datetime/mod.rs
index 4943e764d4..09268aeffd 100644
--- a/src/naive/datetime/mod.rs
+++ b/src/naive/datetime/mod.rs
@@ -13,13 +13,13 @@ use core::{fmt, str};
 #[cfg(feature = "rkyv")]
 use rkyv::{Archive, Deserialize, Serialize};
 
+use crate::duration::Duration as OldDuration;
 #[cfg(any(feature = "alloc", feature = "std"))]
 use crate::format::DelayedFormat;
 use crate::format::{parse, parse_and_remainder, ParseError, ParseResult, Parsed, StrftimeItems};
 use crate::format::{Fixed, Item, Numeric, Pad};
 use crate::naive::{Days, IsoWeek, NaiveDate, NaiveTime};
 use crate::offset::Utc;
-use crate::oldtime::Duration as OldDuration;
 use crate::{DateTime, Datelike, LocalResult, Months, TimeZone, Timelike, Weekday};
 
 #[cfg(feature = "rustc-serialize")]
diff --git a/src/naive/datetime/tests.rs b/src/naive/datetime/tests.rs
index 66f3ff9957..5ded98f385 100644
--- a/src/naive/datetime/tests.rs
+++ b/src/naive/datetime/tests.rs
@@ -1,5 +1,5 @@
 use super::NaiveDateTime;
-use crate::oldtime::Duration as OldDuration;
+use crate::duration::Duration as OldDuration;
 use crate::NaiveDate;
 use crate::{Datelike, FixedOffset, Utc};
 
diff --git a/src/naive/time/mod.rs b/src/naive/time/mod.rs
index 4348e4ca79..43e614bab0 100644
--- a/src/naive/time/mod.rs
+++ b/src/naive/time/mod.rs
@@ -12,13 +12,13 @@ use core::{fmt, str};
 #[cfg(feature = "rkyv")]
 use rkyv::{Archive, Deserialize, Serialize};
 
+use crate::duration::Duration as OldDuration;
 #[cfg(any(feature = "alloc", feature = "std"))]
 use crate::format::DelayedFormat;
 use crate::format::{
     parse, parse_and_remainder, write_hundreds, Fixed, Item, Numeric, Pad, ParseError, ParseResult,
     Parsed, StrftimeItems,
 };
-use crate::oldtime::Duration as OldDuration;
 use crate::Timelike;
 use crate::{expect, try_opt};
 
diff --git a/src/naive/time/tests.rs b/src/naive/time/tests.rs
index 0a45381dea..b77ca87339 100644
--- a/src/naive/time/tests.rs
+++ b/src/naive/time/tests.rs
@@ -1,5 +1,5 @@
 use super::NaiveTime;
-use crate::oldtime::Duration as OldDuration;
+use crate::duration::Duration as OldDuration;
 use crate::Timelike;
 
 #[test]
diff --git a/src/offset/fixed.rs b/src/offset/fixed.rs
index acfae81085..53e734cc16 100644
--- a/src/offset/fixed.rs
+++ b/src/offset/fixed.rs
@@ -11,9 +11,9 @@ use core::str::FromStr;
 use rkyv::{Archive, Deserialize, Serialize};
 
 use super::{LocalResult, Offset, TimeZone};
+use crate::duration::Duration as OldDuration;
 use crate::format::{scan, OUT_OF_RANGE};
 use crate::naive::{NaiveDate, NaiveDateTime, NaiveTime};
-use crate::oldtime::Duration as OldDuration;
 use crate::{DateTime, ParseError, Timelike};
 
 /// The time zone with fixed offset, from UTC-23:59:59 to UTC+23:59:59.
diff --git a/src/round.rs b/src/round.rs
index 69ecef9e8b..9271353b77 100644
--- a/src/round.rs
+++ b/src/round.rs
@@ -2,7 +2,7 @@
 // See README.md and LICENSE.txt for details.
 
 use crate::datetime::DateTime;
-use crate::oldtime::Duration;
+use crate::duration::Duration;
 use crate::NaiveDateTime;
 use crate::TimeZone;
 use crate::Timelike;