Efficient way to convert second to minute and seconds in sql server 2005

Question

Suppose I have 90 seconds. If I want to display the result in terms of minutes and second, I do it by using

select Time= '0' + CAST( 90/60 as varchar(2)) + ':' +  CAST( 90%60 as varchar(2)) 

The output is

Time
01:30

I have appended 0(zero) because if you do a select getdate() the output will be

yyyy-mm-dd hh:mm:ss:ms

What is the standard way and recommended practice to do such a conversion?

Thanks

Answer 1

With hours:

SELECT CONVERT(CHAR(8),DATEADD(second,90,0),108)
00:01:30

Ignoring hours:

SELECT RIGHT(CONVERT(CHAR(8),DATEADD(second,90,0),108),5)
01:30