Set time without smartphone

Hi,
I received this gift (Samsung Gear S2) but at the moment my smartphone (Nexus 5) have some issues and i'm wainting that LG send me a new one or fix it.

I have a big issue, how can i set time without smartphone?

I have try all kind of reset but i do not obtain result.

I hope that this community can be help me to find a solution

thx in advance

bye bye

Ivan

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