diff --git a/packages/better-auth/src/api/routes/account.ts b/packages/better-auth/src/api/routes/account.ts
index 63ce4d6a96..d6278edfda 100644
--- a/packages/better-auth/src/api/routes/account.ts
+++ b/packages/better-auth/src/api/routes/account.ts
@@ -517,11 +517,12 @@ export const getAccessToken = createAuthEndpoint(
 
 		try {
 			let newTokens: OAuth2Tokens | null = null;
-
+			const accessTokenExpired =
+				account.accessTokenExpiresAt &&
+				new Date(account.accessTokenExpiresAt).getTime() - Date.now() < 5_000;
 			if (
 				account.refreshToken &&
-				account.accessTokenExpiresAt &&
-				account.accessTokenExpiresAt.getTime() - Date.now() < 5_000 &&
+				accessTokenExpired &&
 				provider.refreshAccessToken
 			) {
 				newTokens = await provider.refreshAccessToken(
diff --git a/packages/better-auth/src/plugins/admin/admin.ts b/packages/better-auth/src/plugins/admin/admin.ts
index 34c38a427c..bc8b226773 100644
--- a/packages/better-auth/src/plugins/admin/admin.ts
+++ b/packages/better-auth/src/plugins/admin/admin.ts
@@ -110,7 +110,7 @@ export const admin = <O extends AdminOptions>(options?: O) => {
 									if (user.banned) {
 										if (
 											user.banExpires &&
-											user.banExpires.getTime() < Date.now()
+											new Date(user.banExpires).getTime() < Date.now()
 										) {
 											await ctx.context.internalAdapter.updateUser(
 												session.userId,
diff --git a/packages/better-auth/src/plugins/api-key/rate-limit.ts b/packages/better-auth/src/plugins/api-key/rate-limit.ts
index fa4cd68252..7ae88b39dc 100644
--- a/packages/better-auth/src/plugins/api-key/rate-limit.ts
+++ b/packages/better-auth/src/plugins/api-key/rate-limit.ts
@@ -64,7 +64,7 @@ export function isRateLimited(
 		};
 	}
 
-	const timeSinceLastRequest = now.getTime() - lastRequest.getTime();
+	const timeSinceLastRequest = now.getTime() - new Date(lastRequest).getTime();
 
 	if (timeSinceLastRequest > rateLimitTimeWindow) {
 		// Time window has passed, reset the request count.
diff --git a/packages/better-auth/src/plugins/api-key/routes/verify-api-key.ts b/packages/better-auth/src/plugins/api-key/routes/verify-api-key.ts
index 987a06f68a..3200fd0944 100644
--- a/packages/better-auth/src/plugins/api-key/routes/verify-api-key.ts
+++ b/packages/better-auth/src/plugins/api-key/routes/verify-api-key.ts
@@ -48,7 +48,7 @@ export async function validateApiKey({
 
 	if (apiKey.expiresAt) {
 		const now = new Date().getTime();
-		const expiresAt = apiKey.expiresAt.getTime();
+		const expiresAt = new Date(apiKey.expiresAt).getTime();
 		if (now > expiresAt) {
 			try {
 				ctx.context.adapter.delete({
@@ -124,7 +124,7 @@ export async function validateApiKey({
 		let now = new Date().getTime();
 		const refillInterval = apiKey.refillInterval;
 		const refillAmount = apiKey.refillAmount;
-		let lastTime = (lastRefillAt ?? apiKey.createdAt).getTime();
+		let lastTime = new Date(lastRefillAt ?? apiKey.createdAt).getTime();
 
 		if (refillInterval && refillAmount) {
 			// if they provide refill info, then we should refill once the interval is reached.