fix: use half round up round instread of round half to even/banker's rounding

Author: Yuri Zmytrakov

stac_fastapi/core/stac_fastapi/core/datetime_utils.py

@@ -1,5 +1,6 @@
 """Utility functions to handle datetime parsing."""
 
+import math
 from datetime import datetime, timezone
 
 from stac_fastapi.types.rfc3339 import rfc3339_str_to_datetime
@@ -23,7 +24,9 @@ def normalize(dt):
             return ".."
         dt_obj = rfc3339_str_to_datetime(dt)
         dt_utc = dt_obj.astimezone(timezone.utc)
-        rounded_dt = dt_utc.replace(microsecond=round(dt_utc.microsecond / 1000) * 1000)
+        rounded_dt = dt_utc.replace(
+            microsecond=math.floor(dt_utc.microsecond / 1000 + 0.5) * 1000
+        )
         return rounded_dt.isoformat(timespec="milliseconds").replace("+00:00", "Z")
 
     if not isinstance(date_str, str):

stac_fastapi/sfeos_helpers/stac_fastapi/sfeos_helpers/database/datetime.py

@@ -5,6 +5,7 @@
 """
 
 import logging
+import math
 import re
 from datetime import date
 from datetime import datetime as datetime_type
@@ -44,7 +45,9 @@ def normalize_datetime(dt_str):
             return dt_str
         dt_obj = rfc3339_str_to_datetime(dt_str)
         dt_utc = dt_obj.astimezone(timezone.utc)
-        rounded_dt = dt_utc.replace(microsecond=round(dt_utc.microsecond / 1000) * 1000)
+        rounded_dt = dt_utc.replace(
+            microsecond=math.floor(dt_utc.microsecond / 1000 + 0.5) * 1000
+        )
         return rounded_dt.isoformat(timespec="milliseconds").replace("+00:00", "Z")
 
     result: Dict[str, Optional[str]] = {"gte": None, "lte": None}