Writing xpath for html code

to identify a value inside a Dynamic web table . For selecting this value my validation is to check if Column with Upload Date is greater than or equal to certain value. Column with Document type Name has certain text . If the above two conditions are met I have to select the corresponding Id# from the column and click on it. I want to write a xpath for the same with the validation checks as variables . But I have problem identifying the column names with td tags. I am able to write until this Xpath: //table[starts-with(@class,"whiteBg")]/tbody/tr[td] which is identifying all the td values but if I place the //table[starts-with(@class,"whiteBg")]/tbody/tr[td/a[@id,'idvalue']] where id value = "contentplaceHolderMain_rptviewdocs_hdrInkuploadedTime" or any id value for that matter is not working. For the td 's with span I have replaced them with span and also tried with Column names and contain tags. Still not working. I am attaching the html code for the same.I want to write something like //table/tr/td[upload Date > or ="my variable" ] and td[Doc Type Name = "my Variable"]/td[doc Id].