From 83f8dd6fceea3086ab7b2f39ae4c711d7f3230f6 Mon Sep 17 00:00:00 2001
From: Nikita Tretyakov <tretyakov.me@gmail.com>
Date: Fri, 12 Jul 2024 18:07:11 +0200
Subject: [PATCH] Reset system time constant between expression evaluations

---
 fhirpathpy/engine/invocations/constants.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fhirpathpy/engine/invocations/constants.py b/fhirpathpy/engine/invocations/constants.py
index 6643d5d..7ecb798 100644
--- a/fhirpathpy/engine/invocations/constants.py
+++ b/fhirpathpy/engine/invocations/constants.py
@@ -7,11 +7,15 @@ class SystemTime:
     expression. It remains the same for the entire expression evaluation.
     """
 
-    expressionExecutionDateTime = datetime.now()
+    def __init__(self) -> None:
+        self.expressionExecutionDateTime = datetime.now()
 
     def now(self):
         return self.expressionExecutionDateTime
 
+    def reset(self):
+        self.expressionExecutionDateTime = datetime.now()
+
 
 class Constants:
     """
@@ -30,6 +34,7 @@ def reset(self):
         self.now = None
         self.timeOfDay = None
         self.localTimezoneOffset = None
+        systemtime.reset()
 
 
 constants = Constants()