For Modi, it was like any other day as he went about attending to his official engagements without any celebration. Among them was a visit to 'Shauryanjali', a commemorative exhibition on the Golden Jubilee of India's triumph over Pakistan in the 1965 war at the Rajpath lawns here.
He was greeted by leaders from across the political divide, including Congress Vice President Rahul Gandhi, Delhi Chief Minister Arvind Kejriwal and National Conference Working President Omar Abdullah.
His personal twitter account greeted those who accessed it with multi-colour balloons.
In his greetings, Mukherjee said the last year was an important period filled with significant achievements for the Prime Minister and the country.
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"This special day comes as you complete more than fifteen months as the Prime Minister of our great nation. The last year has been an important period filled with significant achievements for you personally and our country.
"Your hard work, dynamism and out of the box thinking has received wide appreciation in the country and abroad," the President was quoted by his official spokesman Venu Rajamony as saying.
In his response, Modi tweeted, "Dear Rashtrapati ji, deeply humbled by your good wishes. Thank you very much. One learns so much from your wisdom & insight."
Rahul Gandhi set aside political differences and extended his greetings. "Best wishes to Prime Minister Narendra Modiji on his birthday," he tweeted.