如何使用 "calends" 造句

1. The money shall be returned to you at the greek calends .
这笔钱不知要到何年何月才会还给你。
2. We will be back by the calends at the latest .
我们最晚下月初就回来。
3. He promised to buy me a new apartment , but I knew it was on the greek calends .
他答应给我买套新公寓,但我知道那是遥遥无期的事情。