In Judaism, the New Moon ushers in a new month

Rosh Chodesh or Rosh ḥodesh (Hebrew: ראש חודש‎; trans. Beginning of the Month; lit. Head of the Month) is the name for the first day of every month in the Hebrew calendar, marked by the appearance of the new moon. The new moon is marked by the day and hour that the new crescent is observed. It is considered a minor holiday, akin to the intermediate days of Passover and Sukkot.^[1]

Ramadan (Arabic: رمضان‎ Ramaḍān, IPA: [rɑmɑˈdˤɑːn]; ^variationsPersian: Ramazan‎) is the ninth month of the Islamic calendar, which lasts 29 or 30 days. It is the Islamic month of fasting, in which participating Muslims refrain from eating, drinking, smoking and sex during daylight hours and is intended to teach Muslims about patience, spirituality, humility and submissiveness to God. Muslims fast for the sake of God (Arabic: الله‎, trans: Allah) and to offer more prayer than usual. Compared to the solar calendar, the dates of Ramadan vary, moving backwards by about eleven days each year depending on the moon; thus, a person will have fasted every day of the Gregorian calendar year in 34 years' time. Muslims believe Ramadan to be an auspicious month for the revelations of God to humankind, being the month in which the first verses of the Qur'an were revealed to the Islamic prophet, Muhammad.

The word Ramadan is derived from an Arabic root R-M-Ḍ, as in words like "ramiḍa" or "ar-ramaḍ" denoting intense heat, scorched ground and shortness of rations. Ramadan, as a name for the month, is of Islamic origin. Prior to Islam and the exclusion of intercalary days from the Islamic calendar, the name of the month was Natiq and the month fell in the warm season.^[2] The word was thus chosen as it well represented the original climate of the month and the physiological conditions precipitated from fasting. In the Qur'an, God proclaims that "fasting has been written down (as obligatory) upon you, as it was upon those before you". According to a hadith, this might refer to the Jewish practice of fasting on Yom Kippur.^[3][4]

National Youth Day is celebrated in India on 12 January on the birthday of Swami Vivekananda. In 1984, the Government of India declared and decided to observe the birthday of Swami Vivekananda (12 January, according to the English calendar) as a National Youth Day every year from 1985 onwards. To quote from the Government of India's communication, 'it was felt that the philosophy of Swamiji and the ideals for which he lived and worked could be a great source of inspiration for the Indian Youth.'^[1]

Swami Vivekananda's birthday (12th January, 1863)^[2], according to the Indian Almanac (Vishuddha Siddhanta Almanac) is on Pausha Krishna Saptami tithi, which falls on different dates in the English Calendar every year (generally in the month of January). This is observed in various centres of Ramakrishna Math and Mission in a traditional Hindu manner which includes mangalarati (a kind of worship practised in India, specially by Hindu people), special worship, homa (fire-ritual), meditation, devotional songs, religious discourses and sandhyarati (vesper service at evenings).