"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.
The Chief Minister said the country's interest should be considered first while framing foreign policy.
"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.
When Atal Bihari Vajpayee was heading the NDA government, there was never the cry from Bengal that it was being discriminated against, but now this is happening, Modi said.
"The UPA government has no right to discriminate against any state. There are now charges of discrimination among Congress and non-Congress states," he said.
Modi's remarks came in the backdrop of West Bengal Chief Minister Mamata Banerjee's charge yesterday that the Centre had imposed an "economic blockade" against her state.
The Gujarat Chief Minister slammed the previous Left Front government in West Bengal, alleging that it had left a lot of potholes during its 32-year rule. "The situation that Congress left Gujarat in, it took me 10 years to correct and fill the potholes," Modi claimed.
"In Bengal, the potholes left by 32 years of misrule will need several years to be filled. I am sure whatever is being done by the present government is in the direction of filling these potholes," he said while praising the efforts of the Trinamool Congress government, which came to power in mid-2011.
In a lighter vein, he said the media was more interested in Mamata-Modi comparison than the economic growth witnessed in Gujarat. "I have not come to Bengal to compare achievements," he said while praising Bengal for having produced stalwarts who led the country in education and social change in the 18th and 19th century.
Listing achievements of his government, he said, "Gujarat has become a hub of automobile industry and solar power and has clocked a 10 per cent growth in agriculture."