fix: ensure datetime uses nano seconds

Author: Yuri Zmytrakov

stac_fastapi/core/stac_fastapi/core/datetime_utils.py

@@ -15,27 +15,45 @@ def format_datetime_range(date_str: str) -> str:
     Returns:
         str: A string formatted as 'YYYY-MM-DDTHH:MM:SSZ/YYYY-MM-DDTHH:MM:SSZ', with '..' used if any element is None.
     """
+    MIN_DATE_NANOS = datetime(1970, 1, 1, tzinfo=timezone.utc)
+    MAX_DATE_NANOS = datetime(2262, 4, 11, 23, 47, 16, 854775, tzinfo=timezone.utc)
 
     def normalize(dt):
         """Normalize datetime string and preserve millisecond precision."""
         dt = dt.strip()
         if not dt or dt == "..":
             return ".."
-        dt_obj = rfc3339_str_to_datetime(dt)
-        dt_utc = dt_obj.astimezone(timezone.utc)
-        return dt_utc.isoformat(timespec="milliseconds").replace("+00:00", "Z")
+        dt_utc = rfc3339_str_to_datetime(dt).astimezone(timezone.utc)
+        if dt_utc < MIN_DATE_NANOS:
+            dt_utc = MIN_DATE_NANOS
+        if dt_utc > MAX_DATE_NANOS:
+            dt_utc = MAX_DATE_NANOS
+        return dt_utc.isoformat(timespec="auto").replace("+00:00", "Z")
 
     if not isinstance(date_str, str):
-        return "../.."
+        return f"{MIN_DATE_NANOS.isoformat(timespec='auto').replace('+00:00','Z')}/{MAX_DATE_NANOS.isoformat(timespec='auto').replace('+00:00','Z')}"
 
     if "/" not in date_str:
         return f"{normalize(date_str)}/{normalize(date_str)}"
 
     try:
         start, end = date_str.split("/", 1)
     except Exception:
-        return "../.."
-    return f"{normalize(start)}/{normalize(end)}"
+        return f"{MIN_DATE_NANOS.isoformat(timespec='auto').replace('+00:00','Z')}/{MAX_DATE_NANOS.isoformat(timespec='auto').replace('+00:00','Z')}"
+
+    normalized_start = normalize(start)
+    normalized_end = normalize(end)
+
+    if normalized_start == "..":
+        normalized_start = MIN_DATE_NANOS.isoformat(timespec="auto").replace(
+            "+00:00", "Z"
+        )
+    if normalized_end == "..":
+        normalized_end = MAX_DATE_NANOS.isoformat(timespec="auto").replace(
+            "+00:00", "Z"
+        )
+
+    return f"{normalized_start}/{normalized_end}"
 
 
 # Borrowed from pystac - https://github.com/stac-utils/pystac/blob/f5e4cf4a29b62e9ef675d4a4dac7977b09f53c8f/pystac/utils.py#L370-L394

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

@@ -8,6 +8,7 @@
 import re
 from datetime import date
 from datetime import datetime as datetime_type
+from datetime import timezone
 from typing import Dict, Optional, Union
 
 from stac_fastapi.types.rfc3339 import DateTimeType
@@ -37,6 +38,8 @@ def return_date(
             always containing 'gte' and 'lte' keys.
     """
     result: Dict[str, Optional[str]] = {"gte": None, "lte": None}
+    MIN_DATE_NANOS = datetime_type(1970, 1, 1, tzinfo=timezone.utc)
+    MAX_DATE_NANOS = datetime_type(2262, 4, 11, 23, 47, 16, 854775, tzinfo=timezone.utc)
 
     if interval is None:
         return result
@@ -45,28 +48,55 @@ def return_date(
         if "/" in interval:
             parts = interval.split("/")
             result["gte"] = (
-                parts[0] if parts[0] != ".." else datetime_type.min.isoformat() + "Z"
+                parts[0] if parts[0] != ".." else MIN_DATE_NANOS.isoformat() + "Z"
             )
             result["lte"] = (
                 parts[1]
                 if len(parts) > 1 and parts[1] != ".."
-                else datetime_type.max.isoformat() + "Z"
+                else MAX_DATE_NANOS.isoformat() + "Z"
             )
         else:
             converted_time = interval if interval != ".." else None
             result["gte"] = result["lte"] = converted_time
         return result
 
     if isinstance(interval, datetime_type):
-        datetime_iso = interval.isoformat()
+        dt_utc = (
+            interval.astimezone(timezone.utc)
+            if interval.tzinfo
+            else interval.replace(tzinfo=timezone.utc)
+        )
+        if dt_utc < MIN_DATE_NANOS:
+            dt_utc = MIN_DATE_NANOS
+        elif dt_utc > MAX_DATE_NANOS:
+            dt_utc = MAX_DATE_NANOS
+        datetime_iso = dt_utc.isoformat()
         result["gte"] = result["lte"] = datetime_iso
     elif isinstance(interval, tuple):
         start, end = interval
         # Ensure datetimes are converted to UTC and formatted with 'Z'
         if start:
-            result["gte"] = start.strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3] + "Z"
+            start_utc = (
+                start.astimezone(timezone.utc)
+                if start.tzinfo
+                else start.replace(tzinfo=timezone.utc)
+            )
+            if start_utc < MIN_DATE_NANOS:
+                start_utc = MIN_DATE_NANOS
+            elif start_utc > MAX_DATE_NANOS:
+                start_utc = MAX_DATE_NANOS
+            result["gte"] = start_utc.strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3] + "Z"
         if end:
-            result["lte"] = end.strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3] + "Z"
+            end_utc = (
+                end.astimezone(timezone.utc)
+                if end.tzinfo
+                else end.replace(tzinfo=timezone.utc)
+            )
+            if end_utc < MIN_DATE_NANOS:
+                end_utc = MIN_DATE_NANOS
+            elif end_utc > MAX_DATE_NANOS:
+                end_utc = MAX_DATE_NANOS
+            result["lte"] = end_utc.strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3] + "Z"
 
     return result
 

stac_fastapi/sfeos_helpers/stac_fastapi/sfeos_helpers/mappings.py

@@ -142,7 +142,7 @@ class Geometry(Protocol):  # noqa
             "type": "object",
             "properties": {
                 # Common https://github.com/radiantearth/stac-spec/blob/master/item-spec/common-metadata.md
-                "datetime": {"type": "date"},
+                "datetime": {"type": "date_nanos"},
                 "start_datetime": {"type": "date"},
                 "end_datetime": {"type": "date"},
                 "created": {"type": "date"},