1601

Millennium: 2nd millennium
Centuries:
Decades:
Years:
December 24: Siege of Kinsale ended
1601 in various calendars
Gregorian calendar1601
MDCI
Ab urbe condita2354
Armenian calendar1050
ԹՎ ՌԾ
Assyrian calendar6351
Balinese saka calendar1522–1523
Bengali calendar1008
Berber calendar2551
English Regnal year43 Eliz. 1 – 44 Eliz. 1
Buddhist calendar2145
Burmese calendar963
Byzantine calendar7109–7110
Chinese calendar庚子年 (Metal Rat)
4298 or 4091
    — to —
辛丑年 (Metal Ox)
4299 or 4092
Coptic calendar1317–1318
Discordian calendar2767
Ethiopian calendar1593–1594
Hebrew calendar5361–5362
Hindu calendars
 - Vikram Samvat1657–1658
 - Shaka Samvat1522–1523
 - Kali Yuga4701–4702
Holocene calendar11601
Igbo calendar601–602
Iranian calendar979–980
Islamic calendar1009–1010
Japanese calendarKeichō 6
(慶長6年)
Javanese calendar1521–1522
Julian calendarGregorian minus 10 days
Korean calendar3934
Minguo calendar311 before ROC
民前311年
Nanakshahi calendar133
Thai solar calendar2143–2144
Tibetan calendar阳金鼠年
(male Iron-Rat)
1727 or 1346 or 574
    — to —
阴金牛年
(female Iron-Ox)
1728 or 1347 or 575

1601 (MDCI) was a common year starting on Monday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1601st year of the Common Era (CE) and Anno Domini (AD) designations, the 601st year of the 2nd millennium, the 1st year of the 17th century, and the 2nd year of the 1600s decade. As of the start of 1601, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

This epoch is the beginning of the 400-year Gregorian leap-year cycle within which digital files first existed; the last year of any such cycle is the only leap year whose year number is divisible by 100.

January 1 of this year (1601-01-01) is used as the base of file dates[1] and of Active Directory Logon dates[2] by Microsoft Windows. It is also the date from which ANSI dates are counted and were adopted by the American National Standards Institute for use with COBOL and other computer languages. All versions of the Microsoft Windows operating system from Windows 95 onward count units of one hundred nanoseconds from this epoch as a counter having 63 bits until 30828/9/14 02:48:05.4775807.[3] April 1 of this year is the earliest possible calendar date in Microsoft Outlook.[4]

  1. ^ Microsoft Windows technical note on file dates, referencing year 1601
  2. ^ Microsoft Windows technical note on file dates, referencing year 1601 Archived March 8, 2009, at the Wayback Machine
  3. ^ "Decimal Time.net".
  4. ^ Office-Watch.com (2019-07-23). "What's the earliest date possible in Outlook?". Office Watch. Retrieved 2024-03-13.