rfqmsg: ensure Unix time conversion to time.Time uses UTC

Set the converted `time.Time` to UTC when transforming from Unix time.
This change promotes consistency and simplifies debugging.

Author: ffranr

rfqmsg/buy_accept.go

@@ -65,7 +65,7 @@ func newBuyAcceptFromWireMsg(wireMsg WireMessage,
 	assetRate := msgData.InAssetRate.Val.IntoBigIntFixedPoint()
 
 	// Convert the unix timestamp in seconds to a time.Time.
-	expiry := time.Unix(int64(msgData.Expiry.Val), 0)
+	expiry := time.Unix(int64(msgData.Expiry.Val), 0).UTC()
 
 	return &BuyAccept{
 		Peer:      wireMsg.Peer,

rfqmsg/buy_request.go

@@ -127,7 +127,7 @@ func NewBuyRequestFromWire(wireMsg WireMessage,
 		return nil, fmt.Errorf("expiry time exceeds maximum int64")
 	}
 
-	expiry := time.Unix(int64(msgData.Expiry.Val), 0)
+	expiry := time.Unix(int64(msgData.Expiry.Val), 0).UTC()
 
 	// Extract the suggested asset to BTC rate if provided.
 	var assetRateHint fn.Option[AssetRate]

rfqmsg/sell_request.go

@@ -121,7 +121,7 @@ func NewSellRequestFromWire(wireMsg WireMessage,
 			"request")
 	}
 
-	expiry := time.Unix(int64(msgData.Expiry.Val), 0)
+	expiry := time.Unix(int64(msgData.Expiry.Val), 0).UTC()
 
 	// Extract the suggested asset to BTC rate if provided.
 	var assetRateHint fn.Option[AssetRate]