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If I had the dimensions joules per metre squared per second (e.g. like for a solar panel), how would I write that?

I've been told

[tex]\frac{Js}{m^2}[/tex]

But I get [tex]\frac{J}{m^2s}[/tex]

Why is it this:

[tex]\frac{J}{1} \times \frac{s}{m^2}[/tex]

And not:

[tex]\frac{J}{m^2} \times \frac{1}{s} [/tex]

I'm grouping joules over metre squared together whereas everyone I've talked to does the first one - why? And am I wrong for saying 'per metre per second'? Should time come first? What is the convention here?

Thank you