Week 1 in 231

WEEK
2

This week starts on Sunday, January 2, 231 and ends on Saturday, January 8, 231.

WEEK EUROPE & ISO
1

This week starts on Monday, January 3, 231 and ends on Sunday, January 9, 231.

Week 1 of 231 begins on January 3, 231 and ends on January 9, 231. It covers days 3 to 9 of the year and falls in quarter 1.

Weeks since this week: 93697

Week 1 of 231 at a glance

Starts (Monday)January 3, 231
Ends (Sunday)January 9, 231
US week (Sunday to Saturday)2 (January 2, 231)
MonthJanuary
QuarterQ1
Days of the year3–9
Year completed at the end of this week2.5%
Weeks left in 231 after this week51
Weeks in 23152
Even or odd weekOdd

Calendar for January 231

January 231
SuMoTuWeThFrSa
Week 521
Week 12345678
Week 29101112131415
Week 316171819202122
Week 423242526272829
Week 53031
USA Calendar

Download Calendar in printable A4 PDF

  • Print January 231 Calendar Open calendar PDF in new window (US version)
  • Print January 231 Calendar Open calendar PDF in new window (EU/ISO Version)
  • Print Full Year 231 Calendar (US version) Open calendar PDF in new window
  • Print Full Year 231 Calendar (EU/ISO Version) Open calendar PDF in new window

    • All Weeks in 231:

    Week 1 in 231 Week 2 in 231 Week 3 in 231 Week 4 in 231 Week 5 in 231 Week 6 in 231 Week 7 in 231 Week 8 in 231 Week 9 in 231 Week 10 in 231 Week 11 in 231 Week 12 in 231 Week 13 in 231 Week 14 in 231 Week 15 in 231 Week 16 in 231 Week 17 in 231 Week 18 in 231 Week 19 in 231 Week 20 in 231 Week 21 in 231 Week 22 in 231 Week 23 in 231 Week 24 in 231 Week 25 in 231 Week 26 in 231 Week 27 in 231 Week 28 in 231 Week 29 in 231 Week 30 in 231 Week 31 in 231 Week 32 in 231 Week 33 in 231 Week 34 in 231 Week 35 in 231 Week 36 in 231 Week 37 in 231 Week 38 in 231 Week 39 in 231 Week 40 in 231 Week 41 in 231 Week 42 in 231 Week 43 in 231 Week 44 in 231 Week 45 in 231 Week 46 in 231 Week 47 in 231 Week 48 in 231 Week 49 in 231 Week 50 in 231 Week 51 in 231 Week 52 in 231

    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 2 of 231. It runs from January 2, 231 to January 8, 231.

    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 229December 29, 228January 4, 229
    Week 1 in 230January 4, 230January 10, 230
    Week 1 in 232January 2, 232January 8, 232
    Week 1 in 233December 31, 232January 6, 233

    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 231 began on January 3, 231. 231 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 231 start and end?

    Week 1 of 231 starts on January 3, 231 and ends on January 9, 231 (ISO 8601, Monday to Sunday).

    Which month is week 1 of 231 in?

    Week 1 of 231 is in January.

    What dates are in week 1 of 231?

    January 3, 231, January 4, 231, January 5, 231, January 6, 231, January 7, 231, January 8, 231, and January 9, 231

    How many weeks does 231 have?

    231 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 2 of 231. It runs from January 2, 231 to January 8, 231.