Week 1 in 100

WEEK
2

This week starts on Sunday, January 3, 100 and ends on Saturday, January 9, 100.

WEEK EUROPE & ISO
1

This week starts on Monday, January 4, 100 and ends on Sunday, January 10, 100.

Week 1 of 100 begins on January 4, 100 and ends on January 10, 100. It covers days 4 to 10 of the year and falls in quarter 1.

Weeks since this week: 100532

Week 1 of 100 at a glance

Starts (Monday)January 4, 100
Ends (Sunday)January 10, 100
US week (Sunday to Saturday)2 (January 3, 100)
MonthJanuary
QuarterQ1
Days of the year4–10
Year completed at the end of this week2.7%
Weeks left in 100 after this week51
Weeks in 10052
Even or odd weekOdd

Calendar for January 100

January 100
SuMoTuWeThFrSa
Week 5312
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
USA Calendar

Download Calendar in printable A4 PDF

  • Print January 100 Calendar Open calendar PDF in new window (US version)
  • Print January 100 Calendar Open calendar PDF in new window (EU/ISO Version)
  • Print Full Year 100 Calendar (US version) Open calendar PDF in new window
  • Print Full Year 100 Calendar (EU/ISO Version) Open calendar PDF in new window

    • All Weeks in 100:

    Week 1 in 100 Week 2 in 100 Week 3 in 100 Week 4 in 100 Week 5 in 100 Week 6 in 100 Week 7 in 100 Week 8 in 100 Week 9 in 100 Week 10 in 100 Week 11 in 100 Week 12 in 100 Week 13 in 100 Week 14 in 100 Week 15 in 100 Week 16 in 100 Week 17 in 100 Week 18 in 100 Week 19 in 100 Week 20 in 100 Week 21 in 100 Week 22 in 100 Week 23 in 100 Week 24 in 100 Week 25 in 100 Week 26 in 100 Week 27 in 100 Week 28 in 100 Week 29 in 100 Week 30 in 100 Week 31 in 100 Week 32 in 100 Week 33 in 100 Week 34 in 100 Week 35 in 100 Week 36 in 100 Week 37 in 100 Week 38 in 100 Week 39 in 100 Week 40 in 100 Week 41 in 100 Week 42 in 100 Week 43 in 100 Week 44 in 100 Week 45 in 100 Week 46 in 100 Week 47 in 100 Week 48 in 100 Week 49 in 100 Week 50 in 100 Week 51 in 100 Week 52 in 100

    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 100. It runs from January 3, 100 to January 9, 100.

    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 98December 30, 97January 5, 98
    Week 1 in 99December 29, 98January 4, 99
    Week 1 in 101January 3, 101January 9, 101
    Week 1 in 102January 2, 102January 8, 102

    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 100 began on January 4, 100. 100 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 100 start and end?

    Week 1 of 100 starts on January 4, 100 and ends on January 10, 100 (ISO 8601, Monday to Sunday).

    Which month is week 1 of 100 in?

    Week 1 of 100 is in January.

    What dates are in week 1 of 100?

    January 4, 100, January 5, 100, January 6, 100, January 7, 100, January 8, 100, January 9, 100, and January 10, 100

    How many weeks does 100 have?

    100 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 100. It runs from January 3, 100 to January 9, 100.