a calendar month
within a calendar month
during the calendar month
A: When will the new policy take effect?
A：新政策什么时候生效？
B: It will be implemented within the next calendar month.
B：它将在下一个日历月内实施。
1) 指日历上完整的一个月
2) 在商务和法律中用于精确界定时间
3) 区别于固定天数（如30天）的周期
1. A month as it appears on the calendar.
noun phrase
1. A month as it appears on a calendar, rather than a period of a fixed number of days.