Answer

If you mean Posh Dashmi in Jain tradition, a commonly used panchang shows Poush Krishna Dashami on Saturday, 2 January 2027. Posh Dashmi is observed as the birth anniversary of Lord Parshvanath. ( nepalipatro.com.np)

Note

Jain festival dates can vary a little by city, sect, and panchang tradition, so the exact observance may differ slightly in some places. ( drikpanchang.com)