Answer :
Yes you must include the MI element in the format argument of a TO_CHAR function to include the minutes when displaying time.
What is MI element of a TO_CHAR function?
DATETIME or DATE values are converted to character string values using the TO CHAR function. The TO CHAR function returns an NVARCHAR value after evaluating a DATETIME value in accordance with the date-formatting directive you set.
Using the supplied format, Oracle's TO CHAR function converts a datetime value (i.e., of the DATE and TIMESTAMP data types) to a string. In SQL Server, you can convert a datetime value (DATETIME, DATETIME2 data types, for example) to a string using the CONVERT or CAST functions.
Hence the TO_CHAR function has to be included for the minutes when displaying time
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