Answer

There is no single fixed day on which all Jains are required not to go outside.

Explanation

In Jain Dharma, the main principle is to avoid unnecessary movement and harm to living beings as much as possible. So:

• Unnecessary travel is discouraged every day, especially if it may cause harm.
• Night travel is generally avoided because of greater chances of harming जीवs.
• During Paryushan and Das Lakshan, many Jains voluntarily reduce outings, travel, and external activities to focus on prayer, fasting, and आत्म-चिंतन.
• Some people also choose extra restraint on certain observance days, but this is based on personal vow and tradition, not a universal rule for every Jain.

Spiritual Understanding

The spirit of Jain practice is not only about a particular day, but about continuous सावधानी, अहिंसा, and संयम in daily life. Staying indoors on some days can be a form of tapas and discipline, but the deeper aim is to reduce हिंसा and increase spiritual awareness.

Takeaway

So, Jains do not have one common “do not go outside” day. The practice depends on vows, observances, and personal discipline, with extra restraint often seen during Paryushan and Das Lakshan.