Merge file from one barnch to another branch in Clearcase

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I want to merge a file from one branch to another branch in clearcase

for example from Offshore branch to DEV branch.
I want to merge the file with its modification time as it is.

If the modification date of a file(example.asp) is 12-02-2011, after merging the file in DEV branch, the modification time for the file(example.asp) in DEV branch should hold the same modification time(12-02-2011).

Which view should i take? how should i do merge? Please help me as soon as possible.
I do not know where i am missing.

Note: I tried preserve modification time option while checkin and checkout during merging.

With regards
R.K.PRABAKAR