diff --git a/lib/certificate_utils.robot b/lib/certificate_utils.robot
index c779948..0c258cb 100755
--- a/lib/certificate_utils.robot
+++ b/lib/certificate_utils.robot
@@ -283,3 +283,30 @@
 
     Run Keyword If  '${expected_status}' == 'ok'  Should Contain  ${cert_file_content}  ${bmc_cert_content}
     [Return]  ${cert_id}
+
+
+Modify BMC Date
+    [Documentation]  Modify date in BMC.
+    [Arguments]  ${date_set_type}=current
+
+    # Description of argument(s):
+    # date_set_type    Set BMC date to a current, future, old date by 375 days.
+    #                  current - Sets date to local system date.
+    #                  future - Sets to a future date from current date.
+    #                  old - Sets to a old date from current date.
+
+    Redfish Power Off  stack_mode=skip
+    ${current_date_time}=  Get Current Date
+    ${new_time}=  Run Keyword If  '${date_set_type}' == 'current'  Set Variable  ${current_date_time}
+    ...  ELSE IF  '${date_set_type}' == 'future'
+    ...  Add Time To Date  ${current_date_time}  375 days
+    ...  ELSE IF  '${date_set_type}' == 'old'
+    ...  Subtract Time From Date  ${current_date_time}  375 days
+
+    # Enable manual mode.
+    Redfish.Patch  ${REDFISH_NW_PROTOCOL_URI}
+    ...  body={'NTP':{'ProtocolEnabled': ${False}}}
+    ...  valid_status_codes=[${HTTP_OK}, ${HTTP_NO_CONTENT}]
+    Sleep  2s
+    Redfish.Patch  ${REDFISH_BASE_URI}Managers/bmc  body={'DateTime': '${new_time}'}
+    ...  valid_status_codes=[${HTTP_OK}]