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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:
A working solution would be to first convert the date into timestamp format and then to compare these numerical timestamps each other. To convert a date string into a timestamp, PHP provides the function strtotime ($time_string), which accepts a date or a time value and returns the corresponding timestamp.Output:owever, from PHPâs point of view, this behavior is correct, because two strings were compared and so the 2012 date string was definitely the smaller/shorter string. How to properly compare dates in PHP.