diff --git a/web/components/charts/contract/binary.tsx b/web/components/charts/contract/binary.tsx
index a5740a3e..3526933f 100644
--- a/web/components/charts/contract/binary.tsx
+++ b/web/components/charts/contract/binary.tsx
@@ -55,14 +55,14 @@ export const BinaryContractChart = (props: {
   const betPoints = useMemo(() => getBetPoints(bets), [bets])
   const data = useMemo(() => {
     return [
-      { x: startDate, y: startP },
+      { x: new Date(startDate), y: startP },
       ...betPoints,
-      { x: endDate ?? new Date(Date.now() + DAY_MS), y: endP },
+      { x: new Date(endDate ?? Date.now() + DAY_MS), y: endP },
     ]
   }, [startDate, startP, endDate, endP, betPoints])
 
   const rightmostDate = getRightmostVisibleDate(
-    endDate,
+    endDate ? new Date(endDate) : null,
     last(betPoints)?.x,
     new Date(Date.now())
   )
diff --git a/web/components/charts/contract/choice.tsx b/web/components/charts/contract/choice.tsx
index 05d3255e..52bae0f8 100644
--- a/web/components/charts/contract/choice.tsx
+++ b/web/components/charts/contract/choice.tsx
@@ -136,17 +136,17 @@ export const ChoiceContractChart = (props: {
   const betPoints = useMemo(() => getBetPoints(answers, bets), [answers, bets])
   const data = useMemo(
     () => [
-      { x: start, y: answers.map((_) => 0) },
+      { x: new Date(start), y: answers.map((_) => 0) },
       ...betPoints,
       {
-        x: end ?? new Date(Date.now() + DAY_MS),
+        x: new Date(end ?? Date.now() + DAY_MS),
         y: answers.map((a) => getOutcomeProbability(contract, a.id)),
       },
     ],
     [answers, contract, betPoints, start, end]
   )
   const rightmostDate = getRightmostVisibleDate(
-    end,
+    end ? new Date(end) : null,
     last(betPoints)?.x,
     new Date(Date.now())
   )
diff --git a/web/components/charts/contract/pseudo-numeric.tsx b/web/components/charts/contract/pseudo-numeric.tsx
index 385e56dd..4287a57e 100644
--- a/web/components/charts/contract/pseudo-numeric.tsx
+++ b/web/components/charts/contract/pseudo-numeric.tsx
@@ -72,14 +72,14 @@ export const PseudoNumericContractChart = (props: {
   const betPoints = useMemo(() => getBetPoints(bets, scaleP), [bets, scaleP])
   const data = useMemo(
     () => [
-      { x: startDate, y: startP },
+      { x: new Date(startDate), y: startP },
       ...betPoints,
-      { x: endDate ?? new Date(Date.now() + DAY_MS), y: endP },
+      { x: new Date(endDate ?? Date.now() + DAY_MS), y: endP },
     ],
     [betPoints, startDate, startP, endDate, endP]
   )
   const rightmostDate = getRightmostVisibleDate(
-    endDate,
+    endDate ? new Date(endDate) : null,
     last(betPoints)?.x,
     new Date(Date.now())
   )
diff --git a/web/components/charts/helpers.tsx b/web/components/charts/helpers.tsx
index 35c8a335..fdbec204 100644
--- a/web/components/charts/helpers.tsx
+++ b/web/components/charts/helpers.tsx
@@ -259,7 +259,7 @@ export const getDateRange = (contract: Contract) => {
   const { createdTime, closeTime, resolutionTime } = contract
   const isClosed = !!closeTime && Date.now() > closeTime
   const endDate = resolutionTime ?? (isClosed ? closeTime : null)
-  return [new Date(createdTime), endDate ? new Date(endDate) : null] as const
+  return [createdTime, endDate ?? null] as const
 }
 
 export const getRightmostVisibleDate = (