Dr. Zakir Husain had the shortest tenure as President of India, serving from May 13, 1967 to May 3, 1969 - a period of less than 2 years before his death in office. His tenure was approximately 1 year, 11 months, and 21 days. In contrast, Dr. Rajendra Prasad served the longest (12 years), Giani Zail Singh served a full 5-year term, and V.V. Giri served about 3 years (including an acting period). Zakir Husain was the first President to die in office.