long getLastModifiedTime() {
		synchronized (fileSystem) {
			if (folderItem != null) {
				return folderItem.lastModified();
			}
			if (versionedFolderItem != null) {
				return versionedFolderItem.lastModified();
			}
			return 0;
		}
	}
Get a long value representing the time when the data was last modified.
@return the time
Ghidra/Framework/Project/src/main/java/ghidra/framework/data/GhidraFileData.java