Answer by taking a quote from the following article:

Gautam Gambhir ( pronunciation ; born 14 October 1981) is an Indian cricketer, who played all formats of the game. He is a left-handed opening batsman who plays domestic cricket for Delhi, and captained Kolkata Knight Riders in the Indian Premier League (IPL). He made his One Day International (ODI) debut against Bangladesh in 2003, and played his first Test the following year against Australia. He captained the Indian team in six ODIs from late-2010 to late-2011 with India winning all six matches.

Gambhir scored two successive double-hundreds in 2002 (one of them against the visiting Zimbabweans) made him a strong contender for India's opening slot in all three forms of the game. He made his ODI debut against Bangladesh in the TVS Cup in 2003. In his third match, he scored 71 and was named Man of the Match. His maiden century (103 off 97 balls) came against Sri Lanka in 2005. In 2004, he made his Test debut against Australia in the fourth and last Test match of the Border Gavaskar Trophy but did himself no favours by getting out for 3 and 1. He made amends in his second Test, however, scoring 96 against the South Africans. His maiden Test century came against Bangladesh in December 2004. Gambhir then made a number of starts in the home series against Pakistan in 2005, but was able to make only one half-century in six innings. He made 97 in Zimbabwe later that year, but failed to reach 30 against Sri Lanka at home, repeatedly struggling against Chaminda Vaas, and was subsequently dropped from the Test team. He was replaced in Tests by Wasim Jaffer, who made a double hundred and a hundred in seven Tests.  While Gambhir was out of the Test team, he played a number of One Day Internationals for India between 2005 and 2007. However, he was not selected for the 2007 World Cup as the selectors opted for a top-order of Sourav Ganguly, Virender Sehwag, and Sachin Tendulkar. It affected him badly and Gambhir later said that "When I got dropped for the World Cup, there were times I didn't want to play anymore. I didn't want to practise. I couldn't motivate myself." With no other career options, Gambhir stuck with cricket. After India's first-round exit from the tournament, Gambhir was selected for the One Day International on India's 2007 tour of Bangladesh. Believing the series could be his last chance, Gambhir scored his second century on that tour and was subsequently selected for the One Day International on India's tour to Ireland in 2007. He scored an unbeaten 80 against Ireland in the first game of that tour and was awarded the man of the match award for that effort. In the post-match interview, he indicated that performing more consistently was a top priority for his career as he had done so in the past.  Gambhir was selected in India's squad for the 2007 ICC World Twenty20, which India went on to win in South Africa, beating Pakistan in the final. Gambhir performed well in the shortest form of the game, ending the tournament as India's top run scorer, with 227 at an average of 37.83, including three half-centuries which included a crucial 75 runs off 54 balls against Pakistan in the final.

When did his early career begin?