> For WhatsApp and Messenger, I know search is only available on their desktop client... and IRRC only text search (can’t do date/time search alone) is supporte

> For WhatsApp and Messenger, I know search is only available on their desktop client... and IRRC only text search (can’t do date/time search alone) is supported and is on per contact basis. No global search... WhatsApp has search across all conversations in the mobile app (on iOS just pull down on the main screen) and in individual chats (tap on the chat title and select search from the menu).