Field Definitions are Available Here
Collection
The insert date/time the collection entered data provider's database. This date is provided by the data provider.
2008-11-12T14:12:11.350Z
/InsertTime
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:date/gmd:CI_Date/gmd:date/gco:DateTime
Descriptive Information (ECHO)