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TO_CHAR - Convert Datetime to String - Oracle to SQL Server Migration. In Oracle, TO_CHAR function converts a datetime value (DATE, TIMESTAMP data types i.e.) to a string using the specified format. In SQL Server, you can use CONVERT or CAST functions to convert a datetime value (DATETIME, DATETIME2 data types i.e.) to a string. Oracle:
To convert a time_t value back into a string, use date to get local time (that is, time according to the time zone set with date_default_timezone_set; you can ask PHP what that timezone is with date_default_timezone_get), or gmdate to get UTC. share | improve this answer. edited Sep 3 '12 at 20:00.