If logical test value

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Hello,

I am trying to use a formula to only add the value of a certain cell (filled with a time unit)(A1), if the date mentionned cell (filled with a date)(B2) is a bigger date ot the same date as provided in cell (c1).

=IF(B2=>(c1),A1,0:00)

This is what I have know, however it doesnt work. Anybody got any suggestions?