Gas day
Gastag is the place name of
- Gastag (Laufen) , district of the city of Laufen , Berchtesgadener Land district, Bavaria
- Gastag (Siegsdorf) , part of the municipality of Siegsdorf , Traunstein district, Bavaria
- Gastag (Surberg) , part of the community Surberg , Traunstein district, Bavaria
- Gastag (Teisendorf) , district of the Teisendorf market , Berchtesgadener Land district, Bavaria
- Gastag (Waging am See) , district of the market Waging am See , Traunstein district, Bavaria
Gas day (natural gas) is a fixed period of 24 hours in the gas industry.