diff --git a/packages/tendermint-rpc/src/adaptors/v0-33/responses.ts b/packages/tendermint-rpc/src/adaptors/v0-33/responses.ts
index 81af176e..4740558e 100644
--- a/packages/tendermint-rpc/src/adaptors/v0-33/responses.ts
+++ b/packages/tendermint-rpc/src/adaptors/v0-33/responses.ts
@@ -13,7 +13,6 @@ import {
   Base64,
   Base64String,
   DateTime,
-  DateTimeString,
   dictionaryToStringMap,
   Hex,
   HexString,
@@ -286,7 +285,7 @@ interface RpcHeader {
   readonly version: RpcBlockVersion;
   readonly chain_id: string;
   readonly height: IntegerString;
-  readonly time: DateTimeString;
+  readonly time: string;
   readonly num_txs: IntegerString;
   readonly total_txs: IntegerString;
 
@@ -382,7 +381,7 @@ function decodeBroadcastTxCommit(data: RpcBroadcastTxCommitResponse): responses.
 type RpcSignature = {
   readonly block_id_flag: number;
   readonly validator_address: HexString;
-  readonly timestamp: DateTimeString;
+  readonly timestamp: string;
   readonly signature: Base64String;
 };
 
@@ -436,7 +435,7 @@ function decodeValidatorGenesis(data: RpcValidatorGenesis): responses.Validator
 }
 
 interface RpcGenesisResponse {
-  readonly genesis_time: DateTimeString;
+  readonly genesis_time: string;
   readonly chain_id: string;
   readonly consensus_params: RpcConsensusParams;
   // The validators key is used to specify a set of validators for testnets or PoA blockchains.
@@ -519,7 +518,7 @@ interface RpcSyncInfo {
   readonly latest_block_hash: HexString;
   readonly latest_app_hash: HexString;
   readonly latest_block_height: IntegerString;
-  readonly latest_block_time: DateTimeString;
+  readonly latest_block_time: string;
   readonly catching_up: boolean;
 }
 
diff --git a/packages/tendermint-rpc/src/encodings.spec.ts b/packages/tendermint-rpc/src/encodings.spec.ts
index e64c517a..ea89db8e 100644
--- a/packages/tendermint-rpc/src/encodings.spec.ts
+++ b/packages/tendermint-rpc/src/encodings.spec.ts
@@ -2,7 +2,6 @@ import { ReadonlyDate } from "readonly-date";
 
 import {
   DateTime,
-  DateTimeString,
   encodeBlockId,
   encodeBytes,
   encodeInt,
@@ -15,13 +14,13 @@ import { ReadonlyDateWithNanoseconds } from "./responses";
 describe("encodings", () => {
   describe("DateTime", () => {
     it("decodes a string", () => {
-      expect(DateTime.decode("2020-12-15T10:57:26.778Z" as DateTimeString).nanoseconds).toEqual(0);
-      expect(DateTime.decode("2020-12-15T10:57:26.7789Z" as DateTimeString).nanoseconds).toEqual(900000);
-      expect(DateTime.decode("2020-12-15T10:57:26.77809Z" as DateTimeString).nanoseconds).toEqual(90000);
-      expect(DateTime.decode("2020-12-15T10:57:26.778009Z" as DateTimeString).nanoseconds).toEqual(9000);
-      expect(DateTime.decode("2020-12-15T10:57:26.7780009Z" as DateTimeString).nanoseconds).toEqual(900);
-      expect(DateTime.decode("2020-12-15T10:57:26.77800009Z" as DateTimeString).nanoseconds).toEqual(90);
-      expect(DateTime.decode("2020-12-15T10:57:26.778000009Z" as DateTimeString).nanoseconds).toEqual(9);
+      expect(DateTime.decode("2020-12-15T10:57:26.778Z").nanoseconds).toEqual(0);
+      expect(DateTime.decode("2020-12-15T10:57:26.7789Z").nanoseconds).toEqual(900000);
+      expect(DateTime.decode("2020-12-15T10:57:26.77809Z").nanoseconds).toEqual(90000);
+      expect(DateTime.decode("2020-12-15T10:57:26.778009Z").nanoseconds).toEqual(9000);
+      expect(DateTime.decode("2020-12-15T10:57:26.7780009Z").nanoseconds).toEqual(900);
+      expect(DateTime.decode("2020-12-15T10:57:26.77800009Z").nanoseconds).toEqual(90);
+      expect(DateTime.decode("2020-12-15T10:57:26.778000009Z").nanoseconds).toEqual(9);
     });
 
     it("encodes a string", () => {
diff --git a/packages/tendermint-rpc/src/encodings.ts b/packages/tendermint-rpc/src/encodings.ts
index aaab84a1..964554ca 100644
--- a/packages/tendermint-rpc/src/encodings.ts
+++ b/packages/tendermint-rpc/src/encodings.ts
@@ -7,7 +7,6 @@ import { BlockId, ReadonlyDateWithNanoseconds, Version } from "./responses";
 export type Base64String = string & As<"base64">;
 export type HexString = string & As<"hex">;
 export type IntegerString = string & As<"integer">;
-export type DateTimeString = string & As<"datetime">;
 
 /**
  * A runtime checker that ensures a given value is set (i.e. not undefined or null)
@@ -172,7 +171,7 @@ export class Base64 {
 }
 
 export class DateTime {
-  public static decode(dateTimeString: DateTimeString): ReadonlyDateWithNanoseconds {
+  public static decode(dateTimeString: string): ReadonlyDateWithNanoseconds {
     const readonlyDate = fromRfc3339(dateTimeString);
     const nanosecondsMatch = dateTimeString.match(/\.(\d+)Z$/);
     const nanoseconds = nanosecondsMatch ? nanosecondsMatch[1].slice(3) : "";
@@ -180,10 +179,10 @@ export class DateTime {
     return readonlyDate as ReadonlyDateWithNanoseconds;
   }
 
-  public static encode(dateTime: ReadonlyDateWithNanoseconds): DateTimeString {
+  public static encode(dateTime: ReadonlyDateWithNanoseconds): string {
     const millisecondIso = dateTime.toISOString();
     const nanoseconds = dateTime.nanoseconds?.toString() ?? "";
-    return `${millisecondIso.slice(0, -1)}${nanoseconds.padStart(6, "0")}Z` as DateTimeString;
+    return `${millisecondIso.slice(0, -1)}${nanoseconds.padStart(6, "0")}Z`;
   }
 }
 
diff --git a/packages/tendermint-rpc/types/encodings.d.ts b/packages/tendermint-rpc/types/encodings.d.ts
index 83a48433..8a455cc0 100644
--- a/packages/tendermint-rpc/types/encodings.d.ts
+++ b/packages/tendermint-rpc/types/encodings.d.ts
@@ -3,7 +3,6 @@ import { BlockId, ReadonlyDateWithNanoseconds, Version } from "./responses";
 export declare type Base64String = string & As<"base64">;
 export declare type HexString = string & As<"hex">;
 export declare type IntegerString = string & As<"integer">;
-export declare type DateTimeString = string & As<"datetime">;
 /**
  * A runtime checker that ensures a given value is set (i.e. not undefined or null)
  *
@@ -67,8 +66,8 @@ export declare class Base64 {
   static decode(base64String: Base64String): Uint8Array;
 }
 export declare class DateTime {
-  static decode(dateTimeString: DateTimeString): ReadonlyDateWithNanoseconds;
-  static encode(dateTime: ReadonlyDateWithNanoseconds): DateTimeString;
+  static decode(dateTimeString: string): ReadonlyDateWithNanoseconds;
+  static encode(dateTime: ReadonlyDateWithNanoseconds): string;
 }
 export declare class Hex {
   static encode(data: Uint8Array): HexString;