Yes, I get what you mean. I have certainly seen it in the war/peace context, but I have also heard it in the casual “peaceful day” context before, albeit more rarely maybe? One example I could find is Nichijou ep 5 at 1:12; the voice-over says “Shinonome-ke wa kyou mo heiwa de atta”.
![平和な一日のはじまり by カツヲ [Hitori Bocchi]](https://files.catbox.moe/hanq8o.jpg){kind=link}
Yes, I get what you mean. I have certainly seen it in the war/peace context, but I have also heard it in the casual “peaceful day” context before, albeit more rarely maybe? One example I could find is Nichijou ep 5 at 1:12; the voice-over says “Shinonome-ke wa kyou mo heiwa de atta”.