Convert Character Datetime to numeric

[#1]

I tried the formula scripts posted in other threads with no luck. How to convert timestamp in character to numeric datetime? 

[#2]

1. Create a new column
2. Go into the Col Info dialog and set the format and informat values                                                      
3. Enter the following formula for the new column to convert the character column to a JMP Date Time value

   Informat( Word( 1, :timestamp, "U" ), "yyyy-mm-dd-Thh:mm:ss" )