Julian and Gregorian calendars
The Gregorian calendar, like the Julian calendar before it, has twelve months:
| Chronology | Alphabetic | Days |
|---|---|---|
| 1 | January | 31 days |
| 2 | February | 28 days, 29 in leap years |
| 3 | March | 31 days |
| 4 | April | 30 days |
| 5 | May | 31 days |
| 6 | June | 30 days |
| 7 | July | 31 days |
| 8 | August | 31 days |
| 9 | September | 30 days |
| 10 | October | 31 days |
| 11 | November | 30 days |
| 12 | December | 31 days |

Hebrew calendar
The Hebrew calendar has 12 or 13 months.
- Nisan, 30 days ניסן
- Iyar, 30 days אייר
- Sivan, 30 days סיון
- Tammuz, 29 days תמוז
- Av, 30 days אב
- Elul, 29 days אלול
- Tishri, 30 days תשרי
- Marcheshvan, 29/30 days מַרְחֶשְׁוָן
- Kislev, 30/29 days כסלו
- Tevet, 29 days טבת
- Shevat, 30 days שבט
- Adar 1, 30 days, intercalary month אדר א
- Adar 2, 29 days אדר ב
Adar 1 is only added 7 times in 19 years. In ordinary years, Adar 2 is simply called Adar.

Islamic calendar
There are also twelve months in the Islamic calendar. They are named as follows:
- Muharram (Restricted/sacred) محرّم
- Safar (Empty/Yellow) صفر
- Rabī’ al-Awwal/Rabi’ I (First Spring) ربيع الأول
- Rabī’ ath-Thānī/Rabi` al-Aakhir/Rabi’ II (Second spring or Last spring) ربيع الآخر أو ربيع الثاني
- Jumada al-Awwal/Jumaada I (First Freeze) جمادى الأول
- Jumada ath-Thānī or Jumādā al-Thānī/Jumādā II (Second Freeze or Last Freeze) جمادى الآخر أو جمادى الثاني
- Rajab (To Respect) رجب
- Sha’bān (To Spread and Distribute) شعبان
- Ramadān (Parched Thirst) رمضان
- Shawwāl (To Be Light and Vigorous) شوّال
- Dhu al-Qi’dah (The Master of Truce) ذو القعدة
- Dhu al-Hijjah (The Possessor of Hajj) ذو الحجة

Arabic calendar
| Gregorian month | Arabic month | ||
|---|---|---|---|
| January | يناير | كانون الثاني | Kanun Al-Thani |
| February | فبراير | شباط | Shebat |
| March | مارس | اذار | Adhar |
| April | ابريل | نيسان | Nisan |
| May | مايو | أيّار | Ayyar |
| June | يونيو | حزيران | Ḩazayran |
| July | يوليو | تمّوز | Tammuz |
| August | أغسطس | اَب | ʕAb |
| September | سبتمبر | أيلول | Aylul |
| October | أكتوبر | تشرين الأول | Tishrin Al-Awwal |
| November | نوفمبر | تشرين الثاني | Tishrin Al-Thani |
| December | ديسمبر | كانون الأول | Kanun Al-Awwal |
Hindu calendar
The Hindu calendar has various systems of naming the months. The months in the lunar calendar are:
| Sanskrit name | Tamil name | Telugu name | Nepali name | |
|---|---|---|---|---|
| 1 | Caitra (चैत्र) | Chitirai (சித்திரை) | Chaithramu (చైత్రము) | Chaitra (चैत्र/चैत) |
| 2 | Vaiśākha (वैशाख) | Vaikasi (வைகாசி) | Vaisaakhamu (వైశాఖము) | Baisakh (बैशाख) |
| 3 | Jyeṣṭha (ज्येष्ठ) | Aani (ஆனி) | Jyeshttamu (జ్యేష్ఠము) | Jesth (जेष्ठ/जेठ) |
| 4 | Ashadha (आषाढ) | Aadi (ஆடி) | Aashaadhamu (ఆషాఢము) | Aasad (आषाढ/असार) |
| 5 | Śrāvaṇa (श्रावण) | Aavani (ஆவணி) | Sraavanamu (శ్రావణము) | Srawan (श्रावण/साउन) |
| 6 | Bhadrapada (भाद्रपद) | Purratasi (புரட்டாசி) | Bhaadhrapadamu (భాద్రపదము) | Bhadau (भाद्र|भदौ) |
| 7 | Āśvina (अश्विन) | Aiypasi (ஐப்பசி) | Aasveeyujamu (ఆశ్వయుజము) | Asoj (आश्विन/असोज) |
| 8 | Kārtika (कार्तिक) | Kaarthigai (கார்த்திகை) | Kaarthikamu (కార్తీకము) | Kartik (कार्तिक) |
| 9 | Mārgaśīrṣa (मार्गशीर्ष) | Maargazhi (மார்கழி) | Maargaseershamu (మార్గశిరము) | Mangsir (मार्ग/मंसिर) |
| 10 | Pauṣa (पौष) | Thai (தை) | Pushyamu (పుష్యము) | Push (पौष/पुष/पूस) |
| 11 | Māgha (माघ) | Maasi (மாசி) | Maaghamu (మాఘము) | Magh (माघ) |
| 12 | Phālguna (फाल्गुन) | Panguni (பங்குனி) | Phaalgunamu (ఫాల్గుణము) | Falgun (फाल्गुन/फागुन) |
These are also the names used in the Indian national calendar for the newly redefined months. Purushottam Maas or Adhik Maas (translit. adhika = ‘extra’, māsa = ‘month’) is an extra month in the Hindu calendar that is inserted to keep the lunar and solar calendars aligned. “Purushottam” is an epithet of Vishnu, to whom the month is dedicated.

Iranian calendar (Persian calendar)
The Iranian / Persian calendar, currently used in Iran and Afghanistan, also has 12 months. The Persian names are included in the parentheses. It begins on the northern Spring equinox.
- Farvardin (31 days, فروردین)
- Ordibehesht (31 days, اردیبهشت)
- Khordad (31 days, خرداد)
- Tir (31 days, تیر)
- Mordad (31 days, مرداد)
- Shahrivar (31 days, شهریور)
- Mehr (30 days, مهر)
- Aban (30 days, آبان)
- Azar (30 days, آذر)
- Dey (30 days, دی)
- Bahman (30 days, بهمن)
- Esfand (29 days- 30 days in leap year, اسفند)

Khmer calendar
Like the Hindu calendar, the Khmer calendar consists of both a lunar calendar and a solar calendar.
The Khmer solar calendar is used more commonly than the lunar calendar. There are 12 months and the numbers of days follow the Julian and Gregorian calendar.
| Khmer name | Transliteration | Julian and Gregorian name | |
|---|---|---|---|
| 1 | មករា | Makara | January |
| 2 | កម្ភៈ | Kompeak | February |
| 3 | មិនា or មីនា | Mik Nea or Me Na | March |
| 4 | មេសា | Mesa | April |
| 5 | ឧសភា | Uk Sak Phea | May |
| 6 | មិថុនា | Mik Thok Na | June |
| 7 | កក្កដា | Kak Ka Da | July |
| 8 | សីហា | Seiha | August |
| 9 | កញ្ញា | Kagna | September |
| 10 | តុលា | Tola | October |
| 11 | វិច្ឆិកា | Vicheka | November |
| 12 | ធ្នូ | Thnu | December |

Thai calendar
| English name | Thai name | Abbr. | Transcription | Sanskrit word | Zodiac sign |
|---|---|---|---|---|---|
| January | มกราคม | ม.ค. | mokarakhom | mokara “sea-monster” | Capricorn |
| February | กุมภาพันธ์ | ก.พ. | kumphaphan | kumbha “pitcher, water-pot” | Aquarius |
| March | มีนาคม | มี.ค. | minakhom | mīna “(a specific kind of) fish” | Pisces |
| April | เมษายน | เม.ย. | mesayon | meṣa “ram” | Aries |
| May | พฤษภาคม | พ.ค. | phruetsaphakhom | vṛṣabha “bull” | Taurus |
| June | มิถุนายน | มิ.ย. | mithunayon | mithuna “a pair” | Gemini |
| July | กรกฎาคม | ก.ค. | karakadakhom | karkaṭa “crab” | Cancer |
| August | สิงหาคม | ส.ค. | singhakhom | siṃha “lion” | Leo |
| September | กันยายน | ก.ย. | kanyayon | kanyā “girl” | Virgo |
| October | ตุลาคม | ต.ค. | tulakhom | tulā “balance” | Libra |
| November | พฤศจิกายน | พ.ย. | phruetsachikayon | vṛścika “scorpion” | Scorpio |
| December | ธันวาคม | ธ.ค. | thanwakhom | dhanu “bow, arc” | Sagittarius |

Kollam era (Malayalam) calendar
| Malayalam name | Transliteration | Concurrent Gregorian months | Sanskrit word and meaning | Zodiac sign |
|---|---|---|---|---|
| ചിങ്ങം | chi-ngnga-m | August–September | simha “lion” | Leo |
| കന്നി | ka-nni | September–October | kanyā “girl” | Virgo |
| തുലാം | thu-lā-m | October–November | tulā “balance” | Libra |
| വൃശ്ചികം | vRSh-chi-ka-m | November–December | vṛścika “scorpion” | Scorpio |
| ധനു | dha-nu | December–January | dhanu “bow, arc” | Sagittarius |
| മകരം | ma-ka-ra-m | January–February | mokara “sea-monster” | Capricorn |
| കുംഭം | kum-bha-m | February–March | kumbha “pitcher, water-pot” | Aquarius |
| മീനം | mee-na-m | March–April | mīna “(a specific kind of) fish” | Pisces |
| മേടം | mE-Da-m | April–May | meṣa “ram” | Aries |
| ഇടവം | i-Ta-va-m | May – June | vṛṣabha “bull” | Taurus |
| മിഥുനം | mi-thu-na-m | June–July | mithuna “a pair” | Gemini |
| കർക്കടകം | kar-kka-Ta-ka-m | July–August | karkaṭa “crab” | Cancer |

Germanic calendar
The old Icelandic calendar is not in official use anymore, but some Icelandic holidays and annual feasts are still calculated from it. It has 12 months, broken down into two groups of six often termed “winter months” and “summer months”. The calendar is peculiar in that the months always start on the same weekday rather than on the same date. Hence Þorri always starts on a Friday sometime between January 22 and January 28 (Old style: January 9 to January 15), Góa always starts on a Sunday between February 21 and February 27 (Old style: February 8 to February 14).
- Skammdegi (“Short days”)
- Gormánuður (mid October – mid November, “slaughter month” or “Gór’s month”)
- Ýlir (mid November – mid December, “Yule month”)
- Mörsugur (mid December – mid January, “fat sucking month”)
- Þorri (mid January – mid February, “frozen snow month”)
- Góa (mid February – mid March, “Góa’s month, see Nór”)
- Einmánuður (mid March – mid April, “lone” or “single month”)
- Náttleysi (“Nightless days”)
- Harpa (mid April – mid May, Harpa is a female name, probably a forgotten goddess, first day of Harpa is celebrated as Sumardagurinn fyrsti – first day of summer)
- Skerpla (mid May – mid June, another forgotten goddess)
- Sólmánuður (mid June – mid July, “sun month”)
- Heyannir (mid July – mid August, “hay business month”)
- Tvímánuður (mid August – mid September, “two” or “second month”)
- Haustmánuður (mid September – mid October, “autumn month”)

Old Georgian calendar
| Month | Georgian Month Name | Transliteration | Georgian Other Names | Transliteration |
|---|---|---|---|---|
| January | აპნისი, აპანი | Apnisi, Apani | ||
| February | სურწყუნისი | Surtskunisi | განცხადებისთვე | Gantskhadebistve |
| March | მირკანი | Mirkani | ||
| April | იგრიკა | Igrika | ||
| May | ვარდობისა | Vardobisa | ვარდობისთვე | Vardobistve |
| June | მარიალისა | Marialisa | თიბათვე, ივანობისთვე | Tibatve, Ivanobistve |
| July | თიბისა | Tibisa | მკათათვე, კვირიკობისთვე | Mkatatve, Kvirikobistve |
| August | ქველთობისა | Kveltobisa | მარიამობისთვე | Mariamobistve |
| September | ახალწლისა | Akhaltslisa | ენკენისთვე | Enkenistve |
| October | სთვლისა | Stvlisa | ღვინობისთვე | Gvinobistve |
| November | ტირისკონი | Tiriskoni | გიორგობისთვე, ჭინკობისთვე | Giorgobistve, Chinkobistve |
| December | ტირისდენი | Tirisdeni | ქრისტეშობისთვე | Kristeshobistve |
*NOTE: New Year in ancient Georgia started from September.

Old Swedish calendar
- Torsmånad (January, ‘Torre’s month’ (ancient god))
- Göjemånad (February, ‘Goe’s month’ (ancient goddess))
- Vårmånad (March, ‘Spring month’)
- Gräsmånad (April, ‘Grass month’)
- Blomstermånad (May, ‘Bloom month’)
- Sommarmånad (June, ‘Summer month’)
- Hömånad (July, ‘Hay month’)
- Skördemånad, Rötmånad (August, ‘Harvest month’ or ‘Rotten month’)
- Höstmånad (September, ‘Autumn month’)
- Slaktmånad (October, ‘Slaughter month’)
- Vintermånad (November, ‘Winter month’)
- Julmånad (December, ‘Christmas month’)

Old English calendar
Like the Old Norse calendar, the Anglo-Saxons had their own calendar before they were Christianized which reflected native traditions and deities. These months were attested by Bede in his works On Chronology and The Reckoning of Time written in the 8th century.[9] His months are probably those as written in the Northumbrian dialect of Old English which he was familiar with. The months were so named after the moon; the new moon marking the end of an old month and start of a new month; the full moonoccurring in the middle of the month, after which the month was named.
- Æfterra-ġēola mōnaþ (January, ‘After-Yule month’)
- Sol-mōnaþ (February, ‘Sol month’)
- Hrēð-mōnaþ (March, ‘Hreth month’)
- Ēostur-mōnaþ (April, ‘Ēostur month’)
- Ðrimilce-mōnaþ (May, ‘Three-milkings month’)
- Ærra-Liþa (June, ‘Ere-Litha’)
- Æftera-Liþa (July, ‘After-Litha’)
- Weōd-mōnaþ (August, ‘Weed month’)
- Hāliġ-mōnaþ or Hærfest-mōnaþ (September, ‘Holy month’ or ‘Harvest month’)
- Winter-fylleþ (October, ‘Winter-filleth’)
- Blōt-mōnaþ (November, ‘Blót month’)
- Ærra-ġēola mōnaþ (December, ‘Ere-Yule’)

Old Egyptian calendar
The ancient civil Egyptian calendar had a year that was 365 days long and was divided into 12 months of 30 days each, plus 5 extra days (epagomenes) at the end of the year. The months were divided into 3 “weeks” of ten days each. Because the ancient Egyptian year was almost a quarter of a day shorter than the solar year and stellar events “wandered” through the calendar, it is referred to as Annus Vagus or “Wandering Year”.
- Thout
- Paopi
- Hathor
- Koiak
- Tooba
- Emshir
- Paremhat
- Paremoude
- Pashons
- Paoni
- Epip
- Mesori
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