Week 1 in 401

WEEK
1

This week starts on Sunday, December 31, 400 and ends on Saturday, January 6, 401.

WEEK EUROPE & ISO
1

This week starts on Monday, January 1, 401 and ends on Sunday, January 7, 401.

Week 1 of 401 begins on January 1, 401 and ends on January 7, 401. It covers days 1 to 7 of the year and falls in quarter 1.

Weeks since this week: 84827

Week 1 of 401 at a glance

Starts (Monday)January 1, 401
Ends (Sunday)January 7, 401
US week (Sunday to Saturday)1 (December 31, 400)
MonthJanuary
QuarterQ1
Days of the year1–7
Year completed at the end of this week1.9%
Weeks left in 401 after this week51
Weeks in 40152
Even or odd weekOdd

Calendar for January 401

January 401
SuMoTuWeThFrSa
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
USA Calendar

Download Calendar in printable A4 PDF

  • Print January 401 Calendar Open calendar PDF in new window (US version)
  • Print January 401 Calendar Open calendar PDF in new window (EU/ISO Version)
  • Print Full Year 401 Calendar (US version) Open calendar PDF in new window
  • Print Full Year 401 Calendar (EU/ISO Version) Open calendar PDF in new window

    • All Weeks in 401:

    Week 1 in 401 Week 2 in 401 Week 3 in 401 Week 4 in 401 Week 5 in 401 Week 6 in 401 Week 7 in 401 Week 8 in 401 Week 9 in 401 Week 10 in 401 Week 11 in 401 Week 12 in 401 Week 13 in 401 Week 14 in 401 Week 15 in 401 Week 16 in 401 Week 17 in 401 Week 18 in 401 Week 19 in 401 Week 20 in 401 Week 21 in 401 Week 22 in 401 Week 23 in 401 Week 24 in 401 Week 25 in 401 Week 26 in 401 Week 27 in 401 Week 28 in 401 Week 29 in 401 Week 30 in 401 Week 31 in 401 Week 32 in 401 Week 33 in 401 Week 34 in 401 Week 35 in 401 Week 36 in 401 Week 37 in 401 Week 38 in 401 Week 39 in 401 Week 40 in 401 Week 41 in 401 Week 42 in 401 Week 43 in 401 Week 44 in 401 Week 45 in 401 Week 46 in 401 Week 47 in 401 Week 48 in 401 Week 49 in 401 Week 50 in 401 Week 51 in 401 Week 52 in 401

    Past & Future Week Number 1:

    Week 1 in 2016 Week 1 in 2017 Week 1 in 2018 Week 1 in 2019 Week 1 in 2020 Week 1 in 2021 Week 1 in 2022 Week 1 in 2023 Week 1 in 2024 Week 1 in 2025 Week 1 in 2026 Week 1 in 2027 Week 1 in 2028 Week 1 in 2029 Week 1 in 2030 Week 1 in 2031 Week 1 in 2032 Week 1 in 2033 Week 1 in 2034 Week 1 in 2035 Week 1 in 2036

    US and ISO week numbers

    In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 1 of 401. It runs from December 31, 400 to January 6, 401.

    Even and odd weeks

    Week 1 is an odd week. Even and odd week numbers are used for alternating schedules such as shift rotas, school timetables, custody arrangements and waste collection.

    Week 1 in other years

    FromTo
    Week 1 in 399January 4, 399January 10, 399
    Week 1 in 400January 3, 400January 9, 400
    Week 1 in 402December 31, 401January 6, 402
    Week 1 in 403December 30, 402January 5, 403

    How week numbers are counted

    Most of the world numbers weeks according to the ISO 8601 standard. A week starts on Monday, and week 1 is the week that contains the first Thursday of the year, which is always the week that contains 4 January.

    Week 1 of 401 began on January 1, 401. 401 has 52 ISO weeks.

    Because of this rule, the first days of January can belong to the last week of the previous year, and the last days of December can belong to week 1 of the next year.

    In the United States, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the US week number can differ from the ISO week number.

    Find the week number of a date

    Frequently Asked Questions (FAQ)

    When does week 1 of 401 start and end?

    Week 1 of 401 starts on January 1, 401 and ends on January 7, 401 (ISO 8601, Monday to Sunday).

    Which month is week 1 of 401 in?

    Week 1 of 401 is in January.

    What dates are in week 1 of 401?

    January 1, 401, January 2, 401, January 3, 401, January 4, 401, January 5, 401, January 6, 401, and January 7, 401

    How many weeks does 401 have?

    401 has 52 ISO weeks.

    Is week 1 an even or odd week?

    Week 1 is an odd week.

    What is the US week number for this week?

    In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 1 of 401. It runs from December 31, 400 to January 6, 401.