"They (UPA government) are not watching the calender, but the clock. It is on borrowed time," Modi said at a programme jointly organised here by three city-based chambers of commerce.
Modi, who is widely being perceived as the BJP's Prime Ministerial candidate, accused the Centre of policy paralysis and claimed it had floundered on several issues including that of Italian marines, Bangladesh and Pakistani troops beheading Indian soldiers.
"It is astonishing that the Italian marines, accused of killing Indian fishermen, were allowed to go to their native country to vote, while even if the mother of an Indian accused dies, he is not allowed to go to her funeral," he said.
"Despite India having played a key role in the birth of Bangladesh, no one is giving importance to Delhi in that country during the present crisis there," he claimed.
The government was being soft with Pakistan even after beheading of Indian soldiers, he said.
Echoing his West Bengal counterpart Mamata Banerjee's charge that the Centre has been discriminating against non-Congress states, Modi said the UPA government's approach was detrimental to the country's federal structure.