Rounding a duration to nearest 30 min?

I've been scanning the forums for information on rounding a duration to a fixed number of minutes, such as a quarter of an hour or 30 minutes.
Arbetad tid, januari
Datum
Start
Paus
Total tid
30-min-avrundat
7-jan-13
8:00
16:27
0:30
7:57
In this example, the last column is supposed to round the next to last column's 7:57 to 8:00, but I can't figure out how to do it. If the value had been 7:27, I would have liked it to round it to 7:30. All values are "durations" right now, as this was the only way I could find how to subract correctly...
Any ideas? Thanks!
/Robert

Hi Robert,
I know what you mean, but I am not an Excel guru.
My approach with any spreadsheet is to break the problem down into small steps. Then later I can combine solutions into more complex formulas, or hide the columns or tables that reveal my awkward small steps. Then I feel OK about showing the results to Aunt Nelly or the Head Teacher or a client.
With Durations, I tend to think in arithmetic to the base 60 (hours, minutes) rather than the usual arithmetic to base 10.
This may help:
A2 is formatted as Duration. However, it is ambiguous. Is it hr:min or wk:day or sec:ms?
B2 contains the formula =A2, but is formatted to show the units (hours minutes) from A2. Then we can be sure.
C2 contains this formula:
=DUR2MINUTES(B2)
D2 contains this formula:
=C2/60
E2 contains this formula:
=INT(D2)
F2 contains this formula:
=D2−E2
Now it is time for you to apply base 60 arithmetic .
Regards,
Ian,

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