diff --git a/src/format/mod.rs b/src/format/mod.rs
index a21ffe81f5..ed65d9228f 100644
--- a/src/format/mod.rs
+++ b/src/format/mod.rs
@@ -221,7 +221,6 @@ pub enum Fixed {
     TimezoneOffsetColon,
     /// Offset from the local time to UTC with seconds (`+09:00:00` or `-04:00:00` or `+00:00:00`).
     ///
-    /// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace.
     /// The offset is limited from `-24:00:00` to `+24:00:00`,
     /// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)'s range.
     TimezoneOffsetDoubleColon,
diff --git a/src/format/parse.rs b/src/format/parse.rs
index 8cf14337ec..b675f97f3a 100644
--- a/src/format/parse.rs
+++ b/src/format/parse.rs
@@ -526,7 +526,6 @@ where
                     }
 
                     &TimezoneOffsetColon
-                    | &TimezoneOffsetDoubleColon
                     | &TimezoneOffset
                     | &TimezoneOffsetColonZ
                     | &TimezoneOffsetZ => {
@@ -540,6 +539,17 @@ where
                         parsed.set_offset(i64::from(offset)).map_err(|e| (s, e))?;
                     }
 
+                    &TimezoneOffsetDoubleColon => {
+                        let offset_format = OffsetFormat {
+                            precision: OffsetPrecision::Seconds,
+                            colons: Colons::Colon,
+                            allow_zulu: false,
+                            padding: Pad::Zero,
+                        };
+                        let offset = try_consume!(scan::utc_offset(s.trim_start(), offset_format));
+                        parsed.set_offset(i64::from(offset)).map_err(|e| (s, e))?;
+                    }
+
                     &TimezoneOffsetTripleColon => {
                         let offset_format = OffsetFormat {
                             precision: OffsetPrecision::Hours,