From d856efa1dd81f45b1d2400e4304c35d9ec68b76f Mon Sep 17 00:00:00 2001
From: Joseph Kahn <josephbkahn@gmail.com>
Date: Tue, 10 Sep 2019 12:20:34 -0400
Subject: [PATCH] Update parser.py

---
 arrow/parser.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arrow/parser.py b/arrow/parser.py
index f1469a00b..2720d3c18 100644
--- a/arrow/parser.py
+++ b/arrow/parser.py
@@ -45,7 +45,7 @@ class DateTimeParser(object):
     _TZ_NAME_RE = re.compile(r"\w[\w+\-/]+")
     # NOTE: timestamps cannot be parsed from natural language strings (by removing the ^...$) because it will
     # break cases like "15 Jul 2000" and a format list (see issue #447)
-    _TIMESTAMP_RE = re.compile(r"^\d+\.?\d+$")
+    _TIMESTAMP_RE = re.compile(r"^-?\d+\.?\d+$")
     _TIME_RE = re.compile(r"^(\d{2})(?:\:?(\d{2}))?(?:\:?(\d{2}))?(?:([\.\,])(\d+))?$")
 
     _BASE_INPUT_RE_MAP = {