Week 1 in 123

WEEK
2

This week starts on Sunday, January 3, 123 and ends on Saturday, January 9, 123.

WEEK EUROPE & ISO
1

This week starts on Monday, January 4, 123 and ends on Sunday, January 10, 123.

Week 1 of 123 begins on January 4, 123 and ends on January 10, 123. It covers days 4 to 10 of the year and falls in quarter 1.

Weeks since this week: 99332

Week 1 of 123 at a glance

Starts (Monday)January 4, 123
Ends (Sunday)January 10, 123
US week (Sunday to Saturday)2 (January 3, 123)
MonthJanuary
QuarterQ1
Days of the year4–10
Year completed at the end of this week2.7%
Weeks left in 123 after this week51
Weeks in 12352
Even or odd weekOdd

Calendar for January 123

January 123
SuMoTuWeThFrSa
Week 5312
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
USA Calendar

Download Calendar in printable A4 PDF

  • Print January 123 Calendar Open calendar PDF in new window (US version)
  • Print January 123 Calendar Open calendar PDF in new window (EU/ISO Version)
  • Print Full Year 123 Calendar (US version) Open calendar PDF in new window
  • Print Full Year 123 Calendar (EU/ISO Version) Open calendar PDF in new window

    • All Weeks in 123:

    Week 1 in 123 Week 2 in 123 Week 3 in 123 Week 4 in 123 Week 5 in 123 Week 6 in 123 Week 7 in 123 Week 8 in 123 Week 9 in 123 Week 10 in 123 Week 11 in 123 Week 12 in 123 Week 13 in 123 Week 14 in 123 Week 15 in 123 Week 16 in 123 Week 17 in 123 Week 18 in 123 Week 19 in 123 Week 20 in 123 Week 21 in 123 Week 22 in 123 Week 23 in 123 Week 24 in 123 Week 25 in 123 Week 26 in 123 Week 27 in 123 Week 28 in 123 Week 29 in 123 Week 30 in 123 Week 31 in 123 Week 32 in 123 Week 33 in 123 Week 34 in 123 Week 35 in 123 Week 36 in 123 Week 37 in 123 Week 38 in 123 Week 39 in 123 Week 40 in 123 Week 41 in 123 Week 42 in 123 Week 43 in 123 Week 44 in 123 Week 45 in 123 Week 46 in 123 Week 47 in 123 Week 48 in 123 Week 49 in 123 Week 50 in 123 Week 51 in 123 Week 52 in 123

    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 123. It runs from January 3, 123 to January 9, 123.

    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 121December 30, 120January 5, 121
    Week 1 in 122December 29, 121January 4, 122
    Week 1 in 124January 3, 124January 9, 124
    Week 1 in 125January 1, 125January 7, 125

    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 123 began on January 4, 123. 123 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 123 start and end?

    Week 1 of 123 starts on January 4, 123 and ends on January 10, 123 (ISO 8601, Monday to Sunday).

    Which month is week 1 of 123 in?

    Week 1 of 123 is in January.

    What dates are in week 1 of 123?

    January 4, 123, January 5, 123, January 6, 123, January 7, 123, January 8, 123, January 9, 123, and January 10, 123

    How many weeks does 123 have?

    123 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 123. It runs from January 3, 123 to January 9, 123.