Let us have a look what is common in these states and neighbouring contries

Andhra Pradesh: The state of Andhra Pradesh follows the Telugu calendar, and the current year is Sarvari (2021-2022). The Telugu New Year is celebrated in the month of April, and it usually falls on April 13th or 14th in the Gregorian calendar.

Arunachal Pradesh: The state of Arunachal Pradesh follows the Tibetan calendar, and the current year is Iron Tiger (2149). The Tibetan New Year, also known as Losar, is celebrated in the month of February or March in the Gregorian calendar.

Assam: The state of Assam follows the Assamese calendar, and the current year is Asomiya (1925). The Assamese New Year, also known as Rongali Bihu, is celebrated in mid-April, usually around April 14th in the Gregorian calendar.

Bihar: The state of Bihar follows the Vikram Samvat calendar, and the current year is Vikram Samvat (2079). The Vikram Samvat New Year, also known as Vikram Samvat Parva, is celebrated in the month of Chaitra (March-April) in the Gregorian calendar.

Chhattisgarh: The state of Chhattisgarh follows the Hindu calendar, and the current year is Vikram Samvat (2079). The Hindu New Year, also known as Chaitra Shukla Pratipada, is celebrated in the month of March or April in the Gregorian calendar.

Goa: The state of Goa follows the Gregorian calendar, and the current year is 2023. The New Year in Goa is celebrated on January 1st, like the rest of the world.

Gujarat: The state of Gujarat follows the Vikram Samvat calendar, and the current year is Vikram Samvat (2079). The Gujarati New Year, also known as Vikram Samvat, is celebrated on the day after Diwali, which usually falls in the month of October or November in the Gregorian calendar.

Haryana: The state of Haryana follows the Vikram Samvat calendar, and the current year is Vikram Samvat (2079). The Haryanvi New Year, also known as Haryali Teej, is celebrated in the month of Shravana (July-August) in the Gregorian calendar.

Himachal Pradesh: The state of Himachal Pradesh follows the Vikram Samvat calendar, and the current year is Vikram Samvat (2079). The Himachali New Year, also known as Vikrami Samvat, is celebrated in the month of Chaitra (March-April) in the Gregorian calendar.

Jharkhand: The state of Jharkhand follows the Vikram Samvat calendar, and the current year is Vikram Samvat (2079). The Jharkhandi New Year, also known as Sarhul, is celebrated in the month of April in the Gregorian calendar.

Karnataka: The state of Karnataka follows the Kannada calendar, and the current year is Sarvari (2021-2022). The Kannada New Year, also known as Ugadi, is celebrated in the month of March or April in the Gregorian calendar.

Kerala: Calendar system: Malayalam Calendar (Kollavarsham)
Current year: Kollavarsham 1198
English date of new year: April 14th, 2022 (Vishu)

Madhya Pradesh: Calendar system: Gregorian calendar
Current year: 2023
English date of new year: January 1st

Maharashtra: Calendar system: Gregorian calendar and Marathi calendar
Current year: 2023
English date of new year: January 1st (Gregorian calendar), Gudi Padwa - April 5th, 2022 (Marathi calendar)

Manipur: Calendar system: Manipuri calendar (Sajibu Nongma Panba)
Current year: Sajibu Nongma Panba 1478
English date of new year: April 14th, 2022 (Sajibu Nongma Panba)

Meghalaya: Calendar system: Gregorian calendar
Current year: 2023
English date of new year: January 1st

Mizoram: Calendar system: Mizo calendar
Current year: 2023 is 68th year of the Mizo calendar
English date of new year: December 10th, 2022 (Mizo Kut)

Nagaland: Calendar system: Nagaland calendar
Current year: 2023 is 1963 of the Nagaland calendar
English date of new year: December 1st (Naga New Year's Day)

Odisha: Calendar system: Gregorian calendar and Odia calendar
Current year: 2023
English date of new year: January 1st (Gregorian calendar), Pana Sankranti - April 14th, 2022 (Odia calendar)

Punjab: Calendar system: Nanakshahi calendar
Current year: Nanakshahi 555
English date of new year: March 14th, 2022 (Nanakshahi New Year's Day)

Rajasthan: Calendar system: Vikram Samvat
Current year: Vikram Samvat 2079
English date of new year: November 4th, 2022 (Diwali)

Sikkim: Calendar system: Tibetan Calendar and Gregorian calendar
Current year: 2149 (Tibetan Calendar), 2023 (Gregorian calendar)
English date of new year: January 1st (Gregorian calendar), Losar - February 1st, 2022 (Tibetan Calendar)

Tamil Nadu: Calendar system: Tamil calendar
Current year: Tamil year 5124
English date of new year: April 14th, 2022 (Puthandu)

Telangana: Calendar system: Gregorian calendar and Telugu calendar
Current year: 2023
English date of new year: January 1st (Gregorian calendar), Ugadi - April 5th, 2022 (Telugu calendar)

Tripura: Calendar system: Bengali calendar and Gregorian calendar
Current year: Bengali year 1429 and 2023 (Gregorian calendar)
English date of new year: January 1st (Gregorian calendar), Pahela Baishakh - April 15th, 2022 (Bengali calendar)

Uttar Pradesh: Calendar system: Vikram Samvat
Current year: Vikram Samvat 2079
English date of new year: November 4th, 2022 (Diwali)

Uttarakhand: Calendar system: Vikram Samvat
Current year: Vikram Samvat 2079
English date of new year: November 4th, 2022 (Diwali)

West Bengal: Calendar system: Bengali calendar and Gregorian calendar
Current year: Bengali year 1429 and 2023 (Gregorian calendar)
English date of new year: January 1st (Gregorian calendar), Pahela Baishakh - April 15th, 2022 (Bengali calendar)

Report on the calendar system and new year of neighbouring countries of India

Pakistan: Calendar system: Islamic Hijri calendar and Gregorian calendar
Current year: Hijri year 1444 and 2023 (Gregorian calendar)
English date of new year: August 10th, 2022 (Hijri calendar), January 1st (Gregorian calendar)

Nepal: Calendar system: Bikram Samvat and Gregorian calendar
Current year: Bikram Samvat 2079 and 2023 (Gregorian calendar)
English date of new year: April 14th (Bikram Samvat calendar), January 1st (Gregorian calendar)

Bhutan: Calendar system: Bhutanese calendar and Gregorian calendar
Current year: Bhutanese year 2149 and 2023 (Gregorian calendar)
English date of new year: February 12th, 2023 (Bhutanese calendar), January 1st (Gregorian calendar)

Bangladesh: Calendar system: Bengali calendar and Gregorian calendar
Current year: Bengali year 1429 and 2023 (Gregorian calendar)
English date of new year: April 15th, 2022 (Bengali calendar), January 1st (Gregorian calendar)

Myanmar: Calendar system: Myanmar calendar and Gregorian calendar
Current year: Myanmar year 1384 and 2023 (Gregorian calendar)
English date of new year: April 17th (Myanmar calendar), January 1st (Gregorian calendar)

Sri Lanka: Calendar system: Sinhalese calendar and Gregorian calendar
Current year: Sinhalese year 1944 and 2023 (Gregorian calendar)
English date of new year: April 14th (Sinhalese calendar), January 1st (Gregorian calendar)