diff --git a/specification/maps/data-plane/Common/preview/1.0/common.json b/specification/maps/data-plane/Common/preview/1.0/common.json
index a50864ab973e..c860dab1333f 100644
--- a/specification/maps/data-plane/Common/preview/1.0/common.json
+++ b/specification/maps/data-plane/Common/preview/1.0/common.json
@@ -65,6 +65,7 @@
         "created": {
           "description": "The created timestamp.",
           "type": "string",
+          "format": "date-time",
           "readOnly": true
         },
         "error": {
diff --git a/specification/maps/data-plane/Creator/preview/2.0/alias.json b/specification/maps/data-plane/Creator/preview/2.0/alias.json
index 4240e14e8d08..5072e87c483b 100644
--- a/specification/maps/data-plane/Creator/preview/2.0/alias.json
+++ b/specification/maps/data-plane/Creator/preview/2.0/alias.json
@@ -243,6 +243,7 @@
         "createdTimestamp": {
           "description": "The created timestamp for the alias.",
           "type": "string",
+          "format": "date-time",
           "readOnly": true
         },
         "aliasId": {
@@ -258,6 +259,7 @@
         "lastUpdatedTimestamp": {
           "description": "The timestamp of the last time the alias was assigned.",
           "type": "string",
+          "format": "date-time",
           "readOnly": true
         }
       }
@@ -304,6 +306,7 @@
         "lastUpdatedTimestamp": {
           "description": "The timestamp of the last time the alias was assigned.",
           "type": "string",
+          "format": "date-time",
           "readOnly": true
         }
       }
diff --git a/specification/maps/data-plane/Render/preview/2.0/render.json b/specification/maps/data-plane/Render/preview/2.0/render.json
index 234fba73e523..80e8b03b3116 100644
--- a/specification/maps/data-plane/Render/preview/2.0/render.json
+++ b/specification/maps/data-plane/Render/preview/2.0/render.json
@@ -177,7 +177,8 @@
             "name": "timeStamp",
             "in": "query",
             "description": "The desired date and time of the requested tile. This parameter must be specified in the standard date-time format (e.g. 2019-11-14T16:03:00-08:00), as defined by [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601). This parameter is only supported when tilesetId parameter is set to one of the values below.\n  \n* microsoft.weather.infrared.main: We provide tiles up to 3 hours in the past. Tiles are available in 10-minute intervals. We round the timeStamp value to the nearest 10-minute time frame.\n* microsoft.weather.radar.main: We provide tiles up to 1.5 hours in the past and up to 2 hours in the future. Tiles are available in 5-minute intervals. We round the timeStamp value to the nearest 5-minute time frame.",
-            "type": "string"
+            "type": "string",
+            "format": "date-time"
           },
           {
             "name": "tileSize",
diff --git a/specification/maps/data-plane/Weather/preview/1.0/weather.json b/specification/maps/data-plane/Weather/preview/1.0/weather.json
index 9e376ad9363f..6cbd62b09082 100644
--- a/specification/maps/data-plane/Weather/preview/1.0/weather.json
+++ b/specification/maps/data-plane/Weather/preview/1.0/weather.json
@@ -607,7 +607,8 @@
       "properties": {
         "date": {
           "type": "string",
-          "description": "Date and time of the forecast in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
+          "description": "Date and time of the forecast in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00.",
+          "format": "date-time"
         },
         "iconCode": {
           "type": "integer",
@@ -794,6 +795,7 @@
       "properties": {
         "startTime": {
           "type": "string",
+          "format": "date-time",
           "description": "The date and time for the start of the interval in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
         },
         "minute": {
@@ -889,10 +891,11 @@
       "properties": {
         "date": {
           "type": "string",
-          "description": "Date and time of the forecast in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
+          "description": "Date of the forecast as example, 2019-10-27T00:00:00"
         },
         "effectiveDate": {
           "type": "string",
+          "format": "date-time",
           "description": "Date and time of the beginning of the forecast quarter displayed in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
         },
         "quarter": {
@@ -1137,6 +1140,7 @@
       "properties": {
         "dateTime": {
           "type": "string",
+          "format": "date-time",
           "description": "Date and time of the current observation displayed in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
         },
         "phrase": {
@@ -1248,10 +1252,12 @@
       "properties": {
         "startDate": {
           "type": "string",
+          "format": "date-time",
           "description": "Date and time that the summary is in effect, displayed in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
         },
         "endDate": {
           "type": "string",
+          "format": "date-time",
           "description": "Date and time that the summary period ends, displayed in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
         },
         "severity": {
@@ -1315,6 +1321,7 @@
       "properties": {
         "date": {
           "type": "string",
+          "format": "date-time",
           "description": "Date and time of the current observation displayed in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
         },
         "temperature": {
@@ -1771,10 +1778,12 @@
         },
         "startTime": {
           "type": "string",
+          "format": "date-time",
           "description": "The start date and time of the alert in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00. If the alert crosses multiple time zones the returned time in the response is the local time to the requested coordinate location."
         },
         "endTime": {
           "type": "string",
+          "format": "date-time",
           "description": "The end date and time of the alert in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00. If the alert crosses multiple time zones the returned time in the response is the local time to the requested coordinate location."
         },
         "latestStatus": {
@@ -1885,6 +1894,7 @@
         },
         "dateTime": {
           "type": "string",
+          "format": "date-time",
           "description": "Date and time of the current observation displayed in ISO 8601 format, for example, 2019-10-27T19:39:57-08:00."
         },
         "value": {