diff --git a/docs/syntax/gantt.md b/docs/syntax/gantt.md
index b5ba326c5..b20b6b776 100644
--- a/docs/syntax/gantt.md
+++ b/docs/syntax/gantt.md
@@ -201,7 +201,7 @@ More info in: https://momentjs.com/docs/#/parsing/string-format/
 
 ### Output date format on the axis
 
-The default output date format is YYYY-MM-DD. You can define your custom `axisFormat`, like `2020-Q1` for the first quarter of the year 2020.
+The default output date format is `YYYY-MM-DD`. You can define your custom `axisFormat`, like `2020-Q1` for the first quarter of the year 2020.
 
     axisFormat  %Y-%m-%d
 
@@ -232,7 +232,7 @@ The following formatting strings are supported:
     %Z - time zone offset, such as "-0700".
     %% - a literal "%" character.
 
-More info in: https://github.com/mbostock/d3/wiki/Time-Formatting
+More info in: <https://github.com/d3/d3-time-format/tree/v4.0.0#locale_format>
 
 ### Axis ticks
 
diff --git a/packages/mermaid/src/docs/syntax/gantt.md b/packages/mermaid/src/docs/syntax/gantt.md
index 7025f7035..c9301bfee 100644
--- a/packages/mermaid/src/docs/syntax/gantt.md
+++ b/packages/mermaid/src/docs/syntax/gantt.md
@@ -137,7 +137,7 @@ More info in: https://momentjs.com/docs/#/parsing/string-format/
 
 ### Output date format on the axis
 
-The default output date format is YYYY-MM-DD. You can define your custom `axisFormat`, like `2020-Q1` for the first quarter of the year 2020.
+The default output date format is `YYYY-MM-DD`. You can define your custom `axisFormat`, like `2020-Q1` for the first quarter of the year 2020.
 
 ```
 axisFormat  %Y-%m-%d
@@ -172,7 +172,7 @@ The following formatting strings are supported:
 %% - a literal "%" character.
 ```
 
-More info in: https://github.com/mbostock/d3/wiki/Time-Formatting
+More info in: [https://github.com/d3/d3-time-format/tree/v4.0.0#locale_format](https://github.com/d3/d3-time-format/tree/v4.0.0#locale_format)
 
 ### Axis ticks