The Celtic Church maintained the Greek calendar over against that of Rome.

【over】凯尔特教会保留了古希腊历法，而不用古罗马历法。

The inception date in 776 BC became the basis for the Greek's earliest calendar, where time was marked in four-year increments called olympiads.

公元前 776 年的开始日期成为希腊最早日历的基础，其中时间以四年为增量标记，称为奥林匹克运动会。