PLEASE PLEASE!! time rounding

[marcX]

I want to round the time like this

HH:MM
IF 00:05=00:15
00:10=00:30
00:45=01:00

or
HH:MM
IF 01:05=00:15
01:10=00:30
01:45=02:00

But if the condition does not meet, it will automatically round down descending

ex:1
If 01:04 then it should be

01:04=01:00

ex:2
If 01:44 then it should be

01:44=01:30




PLEASE PLEASE!!!

I realy need it ryt away!

[ConneXionLost]

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