(core) Account for timezone in TODAY()

Summary: return NOW(tz=tz).date()

Test Plan: None, curious to see if this fixes test_time_defaults when run near midnight.

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D3079

sandbox/grist/functions/date.py

@@ -467,11 +467,11 @@ def SECOND(time):
   return _make_datetime(time).second
 
 
-def TODAY():
+def TODAY(tz=None):
   """
   Returns the `date` object for the current date.
   """
-  return datetime.date.today()
+  return NOW(tz=tz).date()
 
 
 _weekday_type_map = {