Week 21 in 166

WEEK
21

This week starts on Sunday, May 18, 166 and ends on Saturday, May 24, 166.

WEEK EUROPE & ISO
21

This week starts on Monday, May 19, 166 and ends on Sunday, May 25, 166.

Week 21 of 166 begins on May 19, 166 and ends on May 25, 166. It covers days 139 to 145 of the year and falls in quarter 2.

Weeks since this week: 97069

Week 21 of 166 at a glance

Starts (Monday)May 19, 166
Ends (Sunday)May 25, 166
US week (Sunday to Saturday)21 (May 18, 166)
MonthMay
QuarterQ2
Days of the year139–145
Year completed at the end of this week39.7%
Weeks left in 166 after this week31
Weeks in 16652
Even or odd weekOdd

Calendar for May 166

May 166
SuMoTuWeThFrSa
Week 18123
Week 1945678910
Week 2011121314151617
Week 2118192021222324
Week 2225262728293031
USA Calendar

Download Calendar in printable A4 PDF

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  • Print Full Year 166 Calendar (EU/ISO Version) Open calendar PDF in new window

    • All Weeks in 166:

    Week 1 in 166 Week 2 in 166 Week 3 in 166 Week 4 in 166 Week 5 in 166 Week 6 in 166 Week 7 in 166 Week 8 in 166 Week 9 in 166 Week 10 in 166 Week 11 in 166 Week 12 in 166 Week 13 in 166 Week 14 in 166 Week 15 in 166 Week 16 in 166 Week 17 in 166 Week 18 in 166 Week 19 in 166 Week 20 in 166 Week 21 in 166 Week 22 in 166 Week 23 in 166 Week 24 in 166 Week 25 in 166 Week 26 in 166 Week 27 in 166 Week 28 in 166 Week 29 in 166 Week 30 in 166 Week 31 in 166 Week 32 in 166 Week 33 in 166 Week 34 in 166 Week 35 in 166 Week 36 in 166 Week 37 in 166 Week 38 in 166 Week 39 in 166 Week 40 in 166 Week 41 in 166 Week 42 in 166 Week 43 in 166 Week 44 in 166 Week 45 in 166 Week 46 in 166 Week 47 in 166 Week 48 in 166 Week 49 in 166 Week 50 in 166 Week 51 in 166 Week 52 in 166

    Past & Future Week Number 21:

    Week 21 in 2016 Week 21 in 2017 Week 21 in 2018 Week 21 in 2019 Week 21 in 2020 Week 21 in 2021 Week 21 in 2022 Week 21 in 2023 Week 21 in 2024 Week 21 in 2025 Week 21 in 2026 Week 21 in 2027 Week 21 in 2028 Week 21 in 2029 Week 21 in 2030 Week 21 in 2031 Week 21 in 2032 Week 21 in 2033 Week 21 in 2034 Week 21 in 2035 Week 21 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 21 of 166. It runs from May 18, 166 to May 24, 166.

    Even and odd weeks

    Week 21 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 21 in other years

    FromTo
    Week 21 in 164May 21, 164May 27, 164
    Week 21 in 165May 20, 165May 26, 165
    Week 21 in 167May 18, 167May 24, 167
    Week 21 in 168May 23, 168May 29, 168

    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 166 began on December 30, 165. 166 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 21 of 166 start and end?

    Week 21 of 166 starts on May 19, 166 and ends on May 25, 166 (ISO 8601, Monday to Sunday).

    Which month is week 21 of 166 in?

    Week 21 of 166 is in May.

    What dates are in week 21 of 166?

    May 19, 166, May 20, 166, May 21, 166, May 22, 166, May 23, 166, May 24, 166, and May 25, 166

    How many weeks does 166 have?

    166 has 52 ISO weeks.

    Is week 21 an even or odd week?

    Week 21 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 21 of 166. It runs from May 18, 166 to May 24, 166.