diff --git a/web/chat/chat-message-list.css b/web/chat/chat-message-list.css
--- a/web/chat/chat-message-list.css
+++ b/web/chat/chat-message-list.css
@@ -51,36 +51,6 @@
 div.conversationHeader:last-child {
   padding-top: 6px;
 }
-div.messageLeftTooltip:after {
-  top: 7px;
-  right: -14px;
-  border-color: transparent transparent transparent var(--tool-tip-bg);
-}
-div.messageRightTooltip:after {
-  top: 7px;
-  left: -14px;
-  border-color: transparent var(--tool-tip-bg) transparent transparent;
-}
-div.messageTopLeftTooltip:after {
-  bottom: -14px;
-  left: 4px;
-  border-color: var(--tool-tip-bg) transparent transparent transparent;
-}
-div.messageTopRightTooltip:after {
-  bottom: -14px;
-  right: 4px;
-  border-color: var(--tool-tip-bg) transparent transparent transparent;
-}
-div.messageBottomLeftTooltip:after {
-  top: -14px;
-  left: 4px;
-  border-color: transparent transparent var(--tool-tip-bg) transparent;
-}
-div.messageBottomRightTooltip:after {
-  top: -14px;
-  right: 4px;
-  border-color: transparent transparent var(--tool-tip-bg) transparent;
-}
 
 div.messageActionActiveArea {
   position: absolute;
diff --git a/web/chat/message-timestamp-tooltip.react.js b/web/chat/message-timestamp-tooltip.react.js
deleted file mode 100644
--- a/web/chat/message-timestamp-tooltip.react.js
+++ /dev/null
@@ -1,146 +0,0 @@
-// @flow
-
-import invariant from 'invariant';
-import * as React from 'react';
-
-import { isComposableMessageType } from 'lib/types/message-types';
-import { longAbsoluteDate } from 'lib/utils/date-utils';
-
-import css from './chat-message-list.css';
-import type { OnMessagePositionWithContainerInfo } from './position-types';
-import {
-  type TooltipPosition,
-  tooltipPositions,
-  sizeOfTooltipArrow,
-} from './tooltip-utils';
-import {
-  TooltipMenu,
-  type TooltipStyle,
-  TooltipTextItem,
-} from './tooltip.react';
-
-const availablePositionsForComposedViewerMessage = [
-  tooltipPositions.BOTTOM_RIGHT,
-];
-const availablePositionsForNonComposedOrNonViewerMessage = [
-  tooltipPositions.LEFT,
-];
-
-type Props = {
-  +messagePositionInfo: OnMessagePositionWithContainerInfo,
-  +timeZone: ?string,
-};
-function MessageTimestampTooltip(props: Props): React.Node {
-  const { messagePositionInfo, timeZone } = props;
-  const { time, creator, type } = messagePositionInfo.item.messageInfo;
-
-  const text = React.useMemo(() => longAbsoluteDate(time, timeZone), [
-    time,
-    timeZone,
-  ]);
-  const availableTooltipPositions = React.useMemo(() => {
-    const { isViewer } = creator;
-    const isComposed = isComposableMessageType(type);
-    return isComposed && isViewer
-      ? availablePositionsForComposedViewerMessage
-      : availablePositionsForNonComposedOrNonViewerMessage;
-  }, [creator, type]);
-
-  const { messagePosition, containerPosition } = messagePositionInfo;
-  const pointingToInfo = React.useMemo(() => {
-    return {
-      containerPosition,
-      itemPosition: messagePosition,
-    };
-  }, [messagePosition, containerPosition]);
-
-  const getTooltipStyle = React.useCallback(
-    (tooltipPosition: TooltipPosition) =>
-      getTimestampTooltipStyle(messagePositionInfo, tooltipPosition),
-    [messagePositionInfo],
-  );
-  return (
-    <TooltipMenu
-      availableTooltipPositions={availableTooltipPositions}
-      targetPositionInfo={pointingToInfo}
-      layoutPosition="absolute"
-      getStyle={getTooltipStyle}
-    >
-      <TooltipTextItem text={text} />
-    </TooltipMenu>
-  );
-}
-
-function getTimestampTooltipStyle(
-  messagePositionInfo: OnMessagePositionWithContainerInfo,
-  tooltipPosition: TooltipPosition,
-): TooltipStyle {
-  const { messagePosition, containerPosition } = messagePositionInfo;
-  const { height: containerHeight, width: containerWidth } = containerPosition;
-
-  let style, className;
-  if (tooltipPosition === tooltipPositions.LEFT) {
-    const centerOfMessage = messagePosition.top + messagePosition.height / 2;
-    const tooltipPointing = Math.max(
-      Math.min(centerOfMessage, containerHeight),
-      0,
-    );
-    style = {
-      right: containerWidth - messagePosition.left + sizeOfTooltipArrow,
-      top: tooltipPointing,
-    };
-    className = css.messageLeftTooltip;
-  } else if (tooltipPosition === tooltipPositions.RIGHT) {
-    const centerOfMessage = messagePosition.top + messagePosition.height / 2;
-    const tooltipPointing = Math.max(
-      Math.min(centerOfMessage, containerHeight),
-      0,
-    );
-    style = {
-      left: messagePosition.right + sizeOfTooltipArrow,
-      top: tooltipPointing,
-    };
-    className = css.messageRightTooltip;
-  } else if (tooltipPosition === tooltipPositions.TOP_LEFT) {
-    const tooltipPointing = Math.min(
-      containerHeight - messagePosition.top,
-      containerHeight,
-    );
-    style = {
-      left: messagePosition.left,
-      bottom: tooltipPointing + sizeOfTooltipArrow,
-    };
-    className = css.messageTopLeftTooltip;
-  } else if (tooltipPosition === tooltipPositions.TOP_RIGHT) {
-    const tooltipPointing = Math.min(
-      containerHeight - messagePosition.top,
-      containerHeight,
-    );
-    style = {
-      right: containerWidth - messagePosition.right,
-      bottom: tooltipPointing + sizeOfTooltipArrow,
-    };
-    className = css.messageTopRightTooltip;
-  } else if (tooltipPosition === tooltipPositions.BOTTOM_LEFT) {
-    const tooltipPointing = Math.min(messagePosition.bottom, containerHeight);
-    style = {
-      left: messagePosition.left,
-      top: tooltipPointing + sizeOfTooltipArrow,
-    };
-    className = css.messageBottomLeftTooltip;
-  } else if (tooltipPosition === tooltipPositions.BOTTOM_RIGHT) {
-    const tooltipPointing = Math.min(messagePosition.bottom, containerHeight);
-    style = {
-      right: containerWidth - messagePosition.right,
-      top: tooltipPointing + sizeOfTooltipArrow,
-    };
-    className = css.messageBottomRightTooltip;
-  }
-  invariant(
-    className && style,
-    `${tooltipPosition} is not valid for timestamp tooltip`,
-  );
-  return { className, style };
-}
-
-export default MessageTimestampTooltip;