diff --git a/tableauserverclient/exponential_backoff.py b/tableauserverclient/exponential_backoff.py
index 8e735d73a..8355bddb3 100644
--- a/tableauserverclient/exponential_backoff.py
+++ b/tableauserverclient/exponential_backoff.py
@@ -1,33 +1,34 @@
-import time
-
-# Polling for server-side events (such as job completion) uses exponential backoff for the sleep intervals between polls
-ASYNC_POLL_MIN_INTERVAL = 0.5
-ASYNC_POLL_MAX_INTERVAL = 30
-ASYNC_POLL_BACKOFF_FACTOR = 1.4
-
-
-class ExponentialBackoffTimer:
-    """Timer for polling server-side events with exponential backoff between attempts."""
-
-    def __init__(self, *, timeout=None):
-        self.start_time = time.time()
-        self.timeout = timeout
-        self.current_sleep_interval = ASYNC_POLL_MIN_INTERVAL
-
-    def sleep(self):
-        """Sleep for the next backoff interval, raising TimeoutError if the timeout deadline has passed."""
-        max_sleep_time = ASYNC_POLL_MAX_INTERVAL
-        if self.timeout is not None:
-            elapsed = time.time() - self.start_time
-            if elapsed >= self.timeout:
-                raise TimeoutError(f"Timeout after {elapsed} seconds waiting for asynchronous event")
-            remaining_time = self.timeout - elapsed
-            # Usually, we would sleep for `ASYNC_POLL_MAX_INTERVAL`, but we don't want to sleep over the timeout
-            max_sleep_time = min(ASYNC_POLL_MAX_INTERVAL, remaining_time)
-            # We want to sleep at least for `ASYNC_POLL_MIN_INTERVAL`. This is important to ensure that, as we get
-            # closer to the timeout, we don't accidentally wake up multiple times and hit the server in rapid succession
-            # due to waking up to early from the `sleep`.
-            max_sleep_time = max(max_sleep_time, ASYNC_POLL_MIN_INTERVAL)
-
-        time.sleep(min(self.current_sleep_interval, max_sleep_time))
-        self.current_sleep_interval *= ASYNC_POLL_BACKOFF_FACTOR
+from datetime import datetime, timedelta
+import time
+
+# Polling for server-side events (such as job completion) uses exponential backoff for the sleep intervals between polls
+ASYNC_POLL_MIN_INTERVAL = 0.5
+ASYNC_POLL_MAX_INTERVAL = 30
+ASYNC_POLL_BACKOFF_FACTOR = 1.4
+
+
+class ExponentialBackoffTimer:
+    """Timer for polling server-side events with exponential backoff between attempts."""
+
+    def __init__(self, *, timeout=None):
+        self.start_time = datetime.now()
+        self.timeout = timeout
+        self.current_sleep_interval = ASYNC_POLL_MIN_INTERVAL
+
+    def sleep(self):
+        """Sleep for the next backoff interval, raising TimeoutError if the timeout deadline has passed."""
+        max_sleep_time = ASYNC_POLL_MAX_INTERVAL
+        if self.timeout is not None:
+            elapsed = (datetime.now() - self.start_time).total_seconds()
+            if elapsed >= self.timeout:
+                raise TimeoutError(f"Timeout after {elapsed} seconds waiting for asynchronous event")
+            remaining_time = self.timeout - elapsed
+            # Usually, we would sleep for `ASYNC_POLL_MAX_INTERVAL`, but we don't want to sleep over the timeout
+            max_sleep_time = min(ASYNC_POLL_MAX_INTERVAL, remaining_time)
+            # We want to sleep at least for `ASYNC_POLL_MIN_INTERVAL`. This is important to ensure that, as we get
+            # closer to the timeout, we don't accidentally wake up multiple times and hit the server in rapid succession
+            # due to waking up to early from the `sleep`.
+            max_sleep_time = max(max_sleep_time, ASYNC_POLL_MIN_INTERVAL)
+
+        time.sleep(min(self.current_sleep_interval, max_sleep_time))
+        self.current_sleep_interval *= ASYNC_POLL_BACKOFF_FACTOR