The date and time, in ISO 8601 date-time format (http://www.iso.org/iso/iso8601), when the user's password was last used to sign in to an AWS website. For a list of AWS websites that capture a user's last sign-in time, see the Credential Reports (http://docs.aws.amazon.com/IAM/latest/UserGuide/credential-reports.html) topic in the Using IAM guide. If a password is used more than once in a five-minute span, only the first use is returned in this field. This field is null (not present) when:
The user does not have a password The password exists but has never been used (at least not since IAM started
tracking this information on October 20th, 2014
there is no sign-in data associated with the user This value is returned only in the GetUser and ListUsers actions.