Week 1 in 172

WEEK
1

This week starts on Sunday, December 29, 171 and ends on Saturday, January 4, 172.

WEEK EUROPE & ISO
1

This week starts on Monday, December 30, 171 and ends on Sunday, January 5, 172.

Week 1 of 172 spans the turn of the year: it begins on December 30, 171 and ends on January 5, 172.

Weeks since this week: 96776

Week 1 of 172 at a glance

Starts (Monday)December 30, 171
Ends (Sunday)January 5, 172
US week (Sunday to Saturday)1 (December 29, 171)
MonthDecember / January
QuarterQ1
Year completed at the end of this week1.4%
Weeks left in 172 after this week52
Weeks in 17253
Even or odd weekOdd

Calendar for December 172

December 172
SuMoTuWeThFrSa
Week 4912345
Week 506789101112
Week 5113141516171819
Week 5220212223242526
Week 12728293031
USA Calendar

Download Calendar in printable A4 PDF

  • Print December 172 Calendar Open calendar PDF in new window (US version)
  • Print December 172 Calendar Open calendar PDF in new window (EU/ISO Version)
  • Print Full Year 172 Calendar (US version) Open calendar PDF in new window
  • Print Full Year 172 Calendar (EU/ISO Version) Open calendar PDF in new window

    • All Weeks in 172:

    Week 1 in 172 Week 2 in 172 Week 3 in 172 Week 4 in 172 Week 5 in 172 Week 6 in 172 Week 7 in 172 Week 8 in 172 Week 9 in 172 Week 10 in 172 Week 11 in 172 Week 12 in 172 Week 13 in 172 Week 14 in 172 Week 15 in 172 Week 16 in 172 Week 17 in 172 Week 18 in 172 Week 19 in 172 Week 20 in 172 Week 21 in 172 Week 22 in 172 Week 23 in 172 Week 24 in 172 Week 25 in 172 Week 26 in 172 Week 27 in 172 Week 28 in 172 Week 29 in 172 Week 30 in 172 Week 31 in 172 Week 32 in 172 Week 33 in 172 Week 34 in 172 Week 35 in 172 Week 36 in 172 Week 37 in 172 Week 38 in 172 Week 39 in 172 Week 40 in 172 Week 41 in 172 Week 42 in 172 Week 43 in 172 Week 44 in 172 Week 45 in 172 Week 46 in 172 Week 47 in 172 Week 48 in 172 Week 49 in 172 Week 50 in 172 Week 51 in 172 Week 52 in 172 Week 53 in 172

    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 172. It runs from December 29, 171 to January 4, 172.

    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 170January 1, 170January 7, 170
    Week 1 in 171December 31, 170January 6, 171
    Week 1 in 173January 4, 173January 10, 173
    Week 1 in 174January 3, 174January 9, 174

    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 172 began on December 30, 171. 172 has 53 ISO weeks, because it is a leap year that starts on a Wednesday.

    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 172 start and end?

    Week 1 of 172 starts on December 30, 171 and ends on January 5, 172 (ISO 8601, Monday to Sunday).

    Which month is week 1 of 172 in?

    Week 1 of 172 starts in December and ends in January.

    What dates are in week 1 of 172?

    December 30, 171, December 31, 171, January 1, 172, January 2, 172, January 3, 172, January 4, 172, and January 5, 172

    How many weeks does 172 have?

    172 has 53 ISO weeks, because it is a leap year that starts on a Wednesday.

    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 172. It runs from December 29, 171 to January 4, 172.