calendsyoudaoicibaDictYouDict[calends 词源字典]
"The first day of the month in the ancient Roman calendar", Old English (denoting an appointed time): from Old French calendes, from Latin kalendae, calendae 'first day of the month' (when accounts were due and the order of days was proclaimed); related to Latin calare and Greek kalein 'call, proclaim'.[calends etymology, calends origin, 英语词源]