diff --git a/packages/datalib/src/chartTools.ts b/packages/datalib/src/chartTools.ts
index 7e8d9f908..e9eedef9c 100644
--- a/packages/datalib/src/chartTools.ts
+++ b/packages/datalib/src/chartTools.ts
@@ -34,22 +34,53 @@ export function tryParseChartDate(dateInput: any): ChartDateParsed | null {
   }
 
   if (typeof dateInput !== 'string') return null;
-  const m = dateInput.match(
+  const dateMatch = dateInput.match(
     /^(\d{4})-(\d{2})-(\d{2})(?:[ T](\d{2}):(\d{2}):(\d{2})(?:\.(\d+))?(Z|[+-]\d{2}:\d{2})?)?$/
   );
-  if (!m) return null;
+  const monthMatch = dateInput.match(/^(\d{4})-(\d{2})$/);
+  // const yearMatch = dateInput.match(/^(\d{4})$/);
 
-  const [_notUsed, year, month, day, hour, minute, second, fraction] = m;
+  if (dateMatch) {
+    const [_notUsed, year, month, day, hour, minute, second, fraction] = dateMatch;
 
-  return {
-    year: parseInt(year, 10),
-    month: parseInt(month, 10),
-    day: parseInt(day, 10),
-    hour: parseInt(hour, 10) || 0,
-    minute: parseInt(minute, 10) || 0,
-    second: parseInt(second, 10) || 0,
-    fraction: fraction || undefined,
-  };
+    return {
+      year: parseInt(year, 10),
+      month: parseInt(month, 10),
+      day: parseInt(day, 10),
+      hour: parseInt(hour, 10) || 0,
+      minute: parseInt(minute, 10) || 0,
+      second: parseInt(second, 10) || 0,
+      fraction: fraction || undefined,
+    };
+  }
+
+  if (monthMatch) {
+    const [_notUsed, year, month] = monthMatch;
+    return {
+      year: parseInt(year, 10),
+      month: parseInt(month, 10),
+      day: 1,
+      hour: 0,
+      minute: 0,
+      second: 0,
+      fraction: undefined,
+    };
+  }
+
+  // if (yearMatch) {
+  //   const [_notUsed, year] = yearMatch;
+  //   return {
+  //     year: parseInt(year, 10),
+  //     month: 1,
+  //     day: 1,
+  //     hour: 0,
+  //     minute: 0,
+  //     second: 0,
+  //     fraction: undefined,
+  //   };
+  // }
+
+  return null;
 }
 
 function pad2Digits(number) {