<Table> <Tr> <Th_colspan="2"> Delhi </Th> </Tr> <Tr> <Td_colspan="2"> Union territory and Megacity </Td> </Tr> <Tr> <Td_colspan="2"> National Capital Territory of Delhi </Td> </Tr> <Tr> <Td_colspan="2"> From top clockwise: Lotus temple, Humayun's Tomb, Connaught Place, Akshardham temple and India Gate </Td> </Tr> <Tr> <Td_colspan="2"> Location within India </Td> </Tr> <Tr> <Td_colspan="2"> Coordinates: 28 ° 36 ′ 36" N 77 ° 13 ′ 48" E ﻿ / ﻿ 28.61000 ° N 77.23000 ° E ﻿ / 28.61000; 77.23000 Coordinates: 28 ° 36 ′ 36" N 77 ° 13 ′ 48" E ﻿ / ﻿ 28.61000 ° N 77.23000 ° E ﻿ / 28.61000; 77.23000 </Td> </Tr> <Tr> <Th> Country </Th> <Td> India </Td> </Tr> <Tr> <Th> Settled </Th> <Td> 6th century B.C. </Td> </Tr> <Tr> <Th> Incorporated </Th> <Td> 1857 </Td> </Tr> <Tr> <Th> Capital formation </Th> <Td> 1911 </Td> </Tr> <Tr> <Th> Formation of Union Territory </Th> <Td> 1956 </Td> </Tr> <Tr> <Th> Formation of NCT </Th> <Td> 1 February 1992 </Td> </Tr> <Tr> <Th> Capital </Th> <Td> New Delhi </Td> </Tr> <Tr> <Th> Districts </Th> <Td> 11 </Td> </Tr> <Tr> <Th_colspan="2"> Government </Th> </Tr> <Tr> <Th> Body </Th> <Td> Government of Delhi </Td> </Tr> <Tr> <Th> Lt. Governor </Th> <Td> Anil Baijal, IAS </Td> </Tr> <Tr> <Th> Chief Minister </Th> <Td> Arvind Kejriwal (AAP) </Td> </Tr> <Tr> <Th> Deputy Chief Minister </Th> <Td> Manish Sisodia </Td> </Tr> <Tr> <Th> Chief Secretary </Th> <Td> Anshu Prakash, IAS </Td> </Tr> <Tr> <Th> Commissioner of Police </Th> <Td> Amulya Patnaik, IPS </Td> </Tr> <Tr> <Th_colspan="2"> Area </Th> </Tr> <Tr> <Th> Union territory </Th> <Td> 1,484.0 km (573.0 sq mi) </Td> </Tr> <Tr> <Th> Water </Th> <Td> 18 km (6.9 sq mi) </Td> </Tr> <Tr> <Th> Area rank </Th> <Td> 31st </Td> </Tr> <Tr> <Th> Elevation </Th> <Td> 200--250 m (650--820 ft) </Td> </Tr> <Tr> <Th_colspan="2"> Population (2011) </Th> </Tr> <Tr> <Th> Union territory </Th> <Td> 16,787,941 </Td> </Tr> <Tr> <Th> Density </Th> <Td> 11,312 / km (29,298 / sq mi) </Td> </Tr> <Tr> <Th> Urban </Th> <Td> 16,349,831 (2nd) </Td> </Tr> <Tr> <Th> Megacity </Th> <Td> 11,034,555 (2nd) </Td> </Tr> <Tr> <Th> Metro (2016) </Th> <Td> 26,454,000 (1st) </Td> </Tr> <Tr> <Th> Demonym (s) </Th> <Td> Delhiite </Td> </Tr> <Tr> <Th_colspan="2"> Languages </Th> </Tr> <Tr> <Th> Official </Th> <Td> <Ul> <Li> Hindi </Li> <Li> English </Li> </Ul> </Td> </Tr> <Tr> <Th> Additional official </Th> <Td> <Ul> <Li> Punjabi </Li> <Li> Urdu </Li> </Ul> </Td> </Tr> <Tr> <Th_colspan="2"> GDP </Th> </Tr> <Tr> <Th> Nominal (NCT) </Th> <Td> ₹ 6.86 lakh crore (US $96 billion) (2017 - 18) </Td> </Tr> <Tr> <Th> Nominal per capita </Th> <Td> ₹ 329,093 (US $4,600) (2017 - 18) </Td> </Tr> <Tr> <Th> Metro GDP / PPP </Th> <Td> $167--370 billion </Td> </Tr> <Tr> <Th> Time zone </Th> <Td> UTC + 5.30 (IST) </Td> </Tr> <Tr> <Th> Pincode (s) </Th> <Td> 1100XX </Td> </Tr> <Tr> <Th> Area code (s) </Th> <Td> + 91 11 </Td> </Tr> <Tr> <Th> ISO 3166 code </Th> <Td> IN - DL </Td> </Tr> <Tr> <Th> HDI (2017) </Th> <Td> 0.744 (High) 5th </Td> </Tr> <Tr> <Th> Literacy (2011) </Th> <Td> 86.21% </Td> </Tr> <Tr> <Th> Sex ratio (2011) </Th> <Td> 868 ♀ / 1000 ♂ </Td> </Tr> <Tr> <Th> Website </Th> <Td> delhi.gov.in </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Delhi </Th> </Tr>

When was delhi declared as the capital of india