How much passport validity is needed to apply for a visa?
At least six months from the day you submit the application.
In detail
The High Commission's document words it as “minimum validity of six months as on the date of submission of application for visa” — the clock starts on the day you submit, not the day you travel. This is where people most often come up short: they check that the passport is valid six months past the travel date and find it falls short at submission. Work backwards six months from the expiry date; you must submit before that. If you are short, renew first — renewals take time, so check at the start of your planning.