src/vs/workbench/contrib/localHistory/browser/localHistoryCommands.ts/toLocalHistoryEntryDateLabel
function toLocalHistoryEntryDateLabel(timestamp: number): string {
	return `${LOCAL_HISTORY_DATE_FORMATTER.value.format(timestamp).replace(SEP, '-')}`; // preserving `/` will break editor labels, so replace it with a non-path symbol
}