How to declare an array with columns storing different datatypes/precision

Dear R- Experts,
Seek your help.

I want to creata data as follows.
Ref_array with 4 columns.
1st column should store data of precision: 8.4 (i.e. 8 digits before decimal
point and 4 digits after decimal points)
2nd column: should store data of type date "yyyy-mm-dd hh:mm:ss"
3rd column: only integer value. No decimal points
4th column: percentage values

Please help.

Thank you in advance.

Best Regards,
Suresh

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