合同中可以使用以下表达方式表达起止时间是否包含本数：

1.“on and before”代替“before”

2.“from and including” 或“from and excluding”代替“after”

3.“to and including”或“to but excluding”代替“until”

4.“from and including/excluding...to including/excluding”代替“between...and...”

以上例子摘自【范文祥. 英文合同阅读与分析技巧：法律出版社，2007】