format a date in to the format month day, year hour:minute:second.fff am/pm in swift

To format a date into the desired format, you can use the DateFormatter class in Swift. Here's an example code block that formats the current date into "month day, year hour:minute:second.fff am/pm" format:

main.swift
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM dd, yyyy h:mm:ss.SSS a"
let dateString = dateFormatter.string(from: Date())
print(dateString)
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In the above example code, we created an instance of DateFormatter and set its dateFormat property to the desired format string "MMM dd, yyyy h:mm:ss.SSS a". We then used the string(from:) method of the DateFormatter instance to format the current date into a string using the set format. Finally, we printed the formatted date string to the console.