qml: don't show fiat amount when timestamp more than a day old and historic rates are disabled

electrum/gui/qml/components/controls/FormattedAmount.qml

@@ -47,8 +47,9 @@ GridLayout {
             if (historic && timestamp)
                 fiatLabel.text = '(' + Daemon.fx.fiatValueHistoric(amount, timestamp) + ' ' + Daemon.fx.fiatCurrency + ')'
             else
-                fiatLabel.text = '(' + Daemon.fx.fiatValue(amount) + ' ' + Daemon.fx.fiatCurrency + ')'
-
+                fiatLabel.text = Daemon.fx.isRecent(timestamp)
+                    ? '(' + Daemon.fx.fiatValue(amount) + ' ' + Daemon.fx.fiatCurrency + ')'
+                    : ''
     }
 
     onAmountChanged: setFiatValue()

electrum/gui/qml/components/controls/HistoryItemDelegate.qml

@@ -108,7 +108,11 @@ Item {
                         } else if (Daemon.fx.historicRates) {
                             text = Daemon.fx.fiatValueHistoric(model.value, model.timestamp) + ' ' + Daemon.fx.fiatCurrency
                         } else {
-                            text = Daemon.fx.fiatValue(model.value, false) + ' ' + Daemon.fx.fiatCurrency
+                            if (Daemon.fx.isRecent(model.timestamp)) {
+                                text = Daemon.fx.fiatValue(model.value, false) + ' ' + Daemon.fx.fiatCurrency
+                            } else {
+                                text = ''
+                            }
                         }
                     }
                     Component.onCompleted: updateText()

electrum/gui/qml/qefx.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timedelta
 from decimal import Decimal
 
 from PyQt6.QtCore import pyqtProperty, pyqtSignal, pyqtSlot, QObject, QRegularExpression
@@ -164,3 +164,15 @@ class QEFX(QObject, QtEventListener):
             return str(v.to_integral_value())
         else:
             return self.config.format_amount(v)
+
+    @pyqtSlot(str, result=bool)
+    def isRecent(self, timestamp):
+        # return True if unknown, e.g. timestamp not known yet, tx in mempool
+        try:
+            td = Decimal(timestamp)
+            if td == 0:
+                return True
+        except Exception:
+            return True
+        dt = datetime.fromtimestamp(int(td))
+        return dt + timedelta(days=1) > datetime.today()