Week numbers 2018

2018 has 52 ISO weeks. Week 1: Jan 1 – 7 · Week 52: Dec 24 – 30

2018 at a glance

Weeks in 201852
Week 1January 1, 2018 – January 7, 2018
Week 52December 24, 2018 – December 30, 2018
Days in 2018365
Leap yearNo

All Weeks in 2018

Week From To Month
Week 1 in 2018 January 1, 2018 January 7, 2018 January
Week 2 in 2018 January 8, 2018 January 14, 2018 January
Week 3 in 2018 January 15, 2018 January 21, 2018 January
Week 4 in 2018 January 22, 2018 January 28, 2018 January
Week 5 in 2018 January 29, 2018 February 4, 2018 January / February
Week 6 in 2018 February 5, 2018 February 11, 2018 February
Week 7 in 2018 February 12, 2018 February 18, 2018 February
Week 8 in 2018 February 19, 2018 February 25, 2018 February
Week 9 in 2018 February 26, 2018 March 4, 2018 February / March
Week 10 in 2018 March 5, 2018 March 11, 2018 March
Week 11 in 2018 March 12, 2018 March 18, 2018 March
Week 12 in 2018 March 19, 2018 March 25, 2018 March
Week 13 in 2018 March 26, 2018 April 1, 2018 March / April
Week 14 in 2018 April 2, 2018 April 8, 2018 April
Week 15 in 2018 April 9, 2018 April 15, 2018 April
Week 16 in 2018 April 16, 2018 April 22, 2018 April
Week 17 in 2018 April 23, 2018 April 29, 2018 April
Week 18 in 2018 April 30, 2018 May 6, 2018 April / May
Week 19 in 2018 May 7, 2018 May 13, 2018 May
Week 20 in 2018 May 14, 2018 May 20, 2018 May
Week 21 in 2018 May 21, 2018 May 27, 2018 May
Week 22 in 2018 May 28, 2018 June 3, 2018 May / June
Week 23 in 2018 June 4, 2018 June 10, 2018 June
Week 24 in 2018 June 11, 2018 June 17, 2018 June
Week 25 in 2018 June 18, 2018 June 24, 2018 June
Week 26 in 2018 June 25, 2018 July 1, 2018 June / July
Week 27 in 2018 July 2, 2018 July 8, 2018 July
Week 28 in 2018 July 9, 2018 July 15, 2018 July
Week 29 in 2018 July 16, 2018 July 22, 2018 July
Week 30 in 2018 July 23, 2018 July 29, 2018 July
Week 31 in 2018 July 30, 2018 August 5, 2018 July / August
Week 32 in 2018 August 6, 2018 August 12, 2018 August
Week 33 in 2018 August 13, 2018 August 19, 2018 August
Week 34 in 2018 August 20, 2018 August 26, 2018 August
Week 35 in 2018 August 27, 2018 September 2, 2018 August / September
Week 36 in 2018 September 3, 2018 September 9, 2018 September
Week 37 in 2018 September 10, 2018 September 16, 2018 September
Week 38 in 2018 September 17, 2018 September 23, 2018 September
Week 39 in 2018 September 24, 2018 September 30, 2018 September
Week 40 in 2018 October 1, 2018 October 7, 2018 October
Week 41 in 2018 October 8, 2018 October 14, 2018 October
Week 42 in 2018 October 15, 2018 October 21, 2018 October
Week 43 in 2018 October 22, 2018 October 28, 2018 October
Week 44 in 2018 October 29, 2018 November 4, 2018 October / November
Week 45 in 2018 November 5, 2018 November 11, 2018 November
Week 46 in 2018 November 12, 2018 November 18, 2018 November
Week 47 in 2018 November 19, 2018 November 25, 2018 November
Week 48 in 2018 November 26, 2018 December 2, 2018 November / December
Week 49 in 2018 December 3, 2018 December 9, 2018 December
Week 50 in 2018 December 10, 2018 December 16, 2018 December
Week 51 in 2018 December 17, 2018 December 23, 2018 December
Week 52 in 2018 December 24, 2018 December 30, 2018 December

Calendars 2018

January 2018
MoTuWeThFrSaSu
Week 11234567
Week 2891011121314
Week 315161718192021
Week 422232425262728
Week 5293031
February 2018
MoTuWeThFrSaSu
Week 51234
Week 6567891011
Week 712131415161718
Week 819202122232425
Week 9262728
March 2018
MoTuWeThFrSaSu
Week 91234
Week 10567891011
Week 1112131415161718
Week 1219202122232425
Week 13262728293031
April 2018
MoTuWeThFrSaSu
Week 131
Week 142345678
Week 159101112131415
Week 1616171819202122
Week 1723242526272829
Week 1830
May 2018
MoTuWeThFrSaSu
Week 18123456
Week 1978910111213
Week 2014151617181920
Week 2121222324252627
Week 2228293031
June 2018
MoTuWeThFrSaSu
Week 22123
Week 2345678910
Week 2411121314151617
Week 2518192021222324
Week 26252627282930
July 2018
MoTuWeThFrSaSu
Week 261
Week 272345678
Week 289101112131415
Week 2916171819202122
Week 3023242526272829
Week 313031
August 2018
MoTuWeThFrSaSu
Week 3112345
Week 326789101112
Week 3313141516171819
Week 3420212223242526
Week 352728293031
September 2018
MoTuWeThFrSaSu
Week 3512
Week 363456789
Week 3710111213141516
Week 3817181920212223
Week 3924252627282930
October 2018
MoTuWeThFrSaSu
Week 401234567
Week 41891011121314
Week 4215161718192021
Week 4322232425262728
Week 44293031
November 2018
MoTuWeThFrSaSu
Week 441234
Week 45567891011
Week 4612131415161718
Week 4719202122232425
Week 482627282930
December 2018
MoTuWeThFrSaSu
Week 212
Week 493456789
Week 5010111213141516
Week 5117181920212223
Week 5224252627282930
Week 131

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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 2018 starts on January 1, 2018 and ends on January 7, 2018 (ISO 8601, Monday to Sunday). 2018 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.

Frequently Asked Questions (FAQ)

How many weeks does 2018 have?

2018 has 52 ISO weeks.

When does week 1 of 2018 start?

Week 1 of 2018 starts on January 1, 2018 and ends on January 7, 2018 (ISO 8601, Monday to Sunday).

When does the last week of 2018 end?

Week 52 of 2018 starts on December 24, 2018 and ends on December 30, 2018 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 2020, 2026, 2032, 2037, 2043.

Why do the US and Europe show different week numbers?

Europe follows ISO 8601: weeks start on Monday and week 1 is the week with the first Thursday of the year. In the US, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the two numbers can differ by one.