[Tagging] How to tag Summer/Winter admin_centres (in Indian states)?

[egil]

According to

https://en.wikipedia.org/wiki/States_and_union_territories_of_India

Some of the states have different summer and winter admin_centres.

JOSM complains if I put more than 1 admin_centre in a boundary relation.

See

https://www.openstreetmap.org/relation/1950884 (mumbai =winter only one 
with admin_centre-role)

https://www.openstreetmap.org/relation/1943188 (both winter and summer 
admin_centres has the role "admin_centre" in the relation)


I'm guessing some form of seasonal-tagging would be nice to reflect the 
summer/winter moving of the admin_centre.

Is there any established way of tagging this?

Cheers

Egil