Hi @Open1333 ,
Do you want to format the date column in a SharePoint list?

If so please try JSON Schema



{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "span",
"txtContent": "=getDate([$DateColumn]) + '-' + if(getMonth([$DateColumn])==0,'Jan',if(getMonth([$DateColumn])==1,'Feb',if(getMonth([$DateColumn])==2,'Mar',if(getMonth([$DateColumn])==3,'Apr',if(getMonth([$DateColumn])==4,'May',if(getMonth([$DateColumn])==5,'Jun',if(getMonth([$DateColumn])==6,'Jul',if(getMonth([$DateColumn])==7,'Aug',if(getMonth([$DateColumn])==8,'Sept',if(getMonth([$DateColumn])==9,'Oct',if(getMonth([$DateColumn])==10,'Nov','Dec'))))))))))) + '-' + getYear([$DateColumn])"
}
Best Regards,
Bof