翻译求助：within 12 calendar months of the end of the Cashback quarter.

我的理解within 12 calendar months of the end of the Cashback quarter＝within 12 calendar months (counting)from the end of the Cashback quarter, 也就是“现金返还季度结束起算的12个公历月内”。我看了相关的网页，好像是澳洲新南威尔斯洲的政府网站上的信息，上面有另外的写法我认为是类似的意思：
1. within 12 months of the close of each Cashback quarter和
2. Claims received more than 12 months after the close of each quarter will not be accepted.
希望对你有所帮助。