How to set datetime format in csv file while importing data from CSV to Salesforce Activity Object (Event/Task)

while importing the activity data from one org to another org using dataloader salesforce tool OR http://dataloader.io/ you need to form the date and datetime value like below format, so that its allow to insert succesfully in the respective object. or otherwise you always getting the below error message

SOURCE: ‘ActivityDateTime’ DESTINATION: ‘ActivityDateTime’ is not a valid DATETIME.[Valid date format: MM/DD/YYYYThh:mm:ss.mmmTimeZone (example: 02/20/1987T12:04:12.000GMT+01:00)].

DATE : MM/DD/YYYY (Convert as this format)

DATETIME : MM/DD/YYYYThh:mm:ss.mmZ (see the below screenshot)

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