Moved shared OpenMeteo time parsing code into a shared internal/providers/openmeteo library.

internal/normalizers/openmeteo/common.go

@@ -2,39 +2,18 @@
 package openmeteo
 
 import (
-	"fmt"
-	"strings"
 	"time"
+
+	openmeteo "gitea.maximumdirect.net/ejr/weatherfeeder/internal/providers/openmeteo"
 )
 
 // parseOpenMeteoTime parses Open-Meteo timestamps.
 //
-// Open-Meteo commonly returns "YYYY-MM-DDTHH:MM" (no timezone suffix) when timezone
-// is provided separately. When a timezone suffix is present (RFC3339), we accept it too.
+// The actual parsing logic lives in internal/providers/openmeteo so both the
+// source (envelope EffectiveAt / event ID) and normalizer (canonical payload)
+// can share identical timestamp behavior.
 //
-// This is provider-specific because it relies on Open-Meteo's timezone and offset fields.
+// We keep this thin wrapper to avoid churn in the normalizer package.
 func parseOpenMeteoTime(s string, tz string, utcOffsetSeconds int) (time.Time, error) {
-	s = strings.TrimSpace(s)
-	if s == "" {
-		return time.Time{}, fmt.Errorf("empty time")
-	}
-
-	// If the server returned an RFC3339 timestamp with timezone, treat it as authoritative.
-	if t, err := time.Parse(time.RFC3339, s); err == nil {
-		return t, nil
-	}
-
-	// Typical Open-Meteo format: "2006-01-02T15:04"
-	const layout = "2006-01-02T15:04"
-
-	// Best effort: try to load the timezone as an IANA name.
-	if tz != "" {
-		if loc, err := time.LoadLocation(tz); err == nil {
-			return time.ParseInLocation(layout, s, loc)
-		}
-	}
-
-	// Fallback: use a fixed zone from the offset seconds.
-	loc := time.FixedZone("open-meteo", utcOffsetSeconds)
-	return time.ParseInLocation(layout, s, loc)
+	return openmeteo.ParseTime(s, tz, utcOffsetSeconds)
 }

internal/providers/openmeteo/time.go

@@ -0,0 +1,79 @@
+// FILE: ./internal/providers/openmeteo/time.go
+package openmeteo
+
+import (
+	"fmt"
+	"strings"
+	"time"
+)
+
+// ParseTime parses timestamps as returned by Open-Meteo.
+//
+// Open-Meteo commonly returns timestamps in one of these forms:
+//
+//   - RFC3339 / RFC3339Nano with an explicit timezone suffix, e.g.
+//     "2026-01-10T18:30:00Z" or "2026-01-10T12:30:00-06:00"
+//
+//   - A local time string WITHOUT a timezone suffix, typically:
+//     "YYYY-MM-DDTHH:MM" (and sometimes "YYYY-MM-DDTHH:MM:SS")
+//     In that case, the timezone is provided separately via the top-level
+//     "timezone" field (IANA name) and/or "utc_offset_seconds".
+//
+// Parsing strategy:
+//
+//  1. If the timestamp includes a timezone suffix (RFC3339/RFC3339Nano),
+//     treat it as authoritative.
+//
+//  2. Otherwise, attempt to interpret the timestamp in the provided IANA
+//     timezone name (if loadable), then fall back to a fixed zone derived
+//     from utcOffsetSeconds.
+//
+// This helper lives in internal/providers so BOTH sources and normalizers can
+// share Open-Meteo quirks without duplicating logic.
+func ParseTime(s string, tz string, utcOffsetSeconds int) (time.Time, error) {
+	s = strings.TrimSpace(s)
+	if s == "" {
+		return time.Time{}, fmt.Errorf("empty time")
+	}
+
+	// If the server returned a timezone-aware RFC3339 timestamp, accept it.
+	if t, err := time.Parse(time.RFC3339Nano, s); err == nil {
+		return t, nil
+	}
+	if t, err := time.Parse(time.RFC3339, s); err == nil {
+		return t, nil
+	}
+
+	// Open-Meteo "local timestamp" formats (no timezone suffix).
+	// Commonly "2006-01-02T15:04"; sometimes seconds are present.
+	layouts := []string{
+		"2006-01-02T15:04:05",
+		"2006-01-02T15:04",
+	}
+
+	// Prefer the IANA timezone name if it's valid on this system.
+	if tz = strings.TrimSpace(tz); tz != "" {
+		if loc, err := time.LoadLocation(tz); err == nil {
+			for _, layout := range layouts {
+				if t, err := time.ParseInLocation(layout, s, loc); err == nil {
+					return t, nil
+				}
+			}
+		}
+	}
+
+	// Fall back to a fixed zone derived from the offset seconds.
+	zoneName := tz
+	if zoneName == "" {
+		zoneName = "open-meteo"
+	}
+	loc := time.FixedZone(zoneName, utcOffsetSeconds)
+
+	for _, layout := range layouts {
+		if t, err := time.ParseInLocation(layout, s, loc); err == nil {
+			return t, nil
+		}
+	}
+
+	return time.Time{}, fmt.Errorf("unsupported open-meteo timestamp format: %q", s)
+}

internal/sources/nws/observation.go

@@ -17,10 +17,6 @@ import (
 
 // ObservationSource polls an NWS station observation endpoint and emits a RAW observation Event.
 //
-// Key refactor:
-//   - Source responsibility: fetch bytes + emit a valid event envelope.
-//   - Normalizer responsibility: interpret raw JSON + map to canonical domain model.
-//
 // This corresponds to URLs like:
 //
 //	https://api.weather.gov/stations/KSTL/observations/latest
@@ -62,7 +58,7 @@ func (s *ObservationSource) Poll(ctx context.Context) ([]event.Event, error) {
 	}
 
 	// Event.ID must be set BEFORE normalization (feedkit requires it).
-	// Prefer NWS-provided "id" (stable URL). Fallback to a stable-ish computed key.
+	// Prefer NWS-provided "id" (stable URL). Fallback to a stable computed key.
 	eventID := strings.TrimSpace(meta.ID)
 	if eventID == "" {
 		ts := meta.ParsedTimestamp

internal/sources/openmeteo/observation.go

@@ -11,6 +11,7 @@ import (
 
 	"gitea.maximumdirect.net/ejr/feedkit/config"
 	"gitea.maximumdirect.net/ejr/feedkit/event"
+	"gitea.maximumdirect.net/ejr/weatherfeeder/internal/providers/openmeteo"
 	"gitea.maximumdirect.net/ejr/weatherfeeder/internal/sources/common"
 	"gitea.maximumdirect.net/ejr/weatherfeeder/internal/standards"
 )
@@ -103,7 +104,9 @@ func (s *ObservationSource) fetchRaw(ctx context.Context) (json.RawMessage, open
 		return raw, openMeteoMeta{}, nil
 	}
 
-	if t, err := parseOpenMeteoTime(meta.Current.Time, meta.Timezone, meta.UTCOffsetSeconds); err == nil {
+	// Best effort: compute a stable EffectiveAt + event ID component.
+	// If parsing fails, we simply omit EffectiveAt and fall back to time.Now() in buildEventID.
+	if t, err := openmeteo.ParseTime(meta.Current.Time, meta.Timezone, meta.UTCOffsetSeconds); err == nil {
 		meta.ParsedTimestamp = t.UTC()
 	}
 
@@ -125,25 +128,3 @@ func buildEventID(sourceName string, meta openMeteoMeta) string {
 
 	return fmt.Sprintf("openmeteo:current:%s:%s:%s", sourceName, locKey, ts.Format(time.RFC3339Nano))
 }
-
-func parseOpenMeteoTime(s string, tz string, utcOffsetSeconds int) (time.Time, error) {
-	s = strings.TrimSpace(s)
-	if s == "" {
-		return time.Time{}, fmt.Errorf("empty time")
-	}
-
-	if t, err := time.Parse(time.RFC3339, s); err == nil {
-		return t, nil
-	}
-
-	const layout = "2006-01-02T15:04"
-
-	if tz != "" {
-		if loc, err := time.LoadLocation(tz); err == nil {
-			return time.ParseInLocation(layout, s, loc)
-		}
-	}
-
-	loc := time.FixedZone("open-meteo", utcOffsetSeconds)
-	return time.ParseInLocation(layout, s, loc)
-}