![]() ![]() #Calendar week number 2015 iso#In most ISO 8601 years, there are 52 weeks. The ISO week date 2014-W01-2 is part of calendar year 2013. Parsing an ISO year/week/day combination displays the same issues: format("Y-m-d"), "\n" ![]() To show the ISO 8601 year, you need to use the o specifier. The Y format specifier gives the calendar year which is not the same as the ISO 8601 year. If you do the following in PHP, you get an unexpected answer: format('Y-\WW-N'), "\n" The ISO year starts with (ISO) week 1, day 1, which is always a Monday. As you see with December 31st, the ISO 8601 year ( 2014) is not the same as the calendar year ( 2013). Examples are: 2013-W39-2 for today and 2013-W40 for next Monday. It is also possible to omit the day-of-week ( yyyy "W" ww) to represent the start of the week (Monday) and to add - in the format (such as in yyyy "-W" ww "-" d. PHP supports the formats yyyy "W" wwĭ where yyyy is the ISO 8601 year, "W" a delimiter, ww the week number and d the day of the week (with 1 being Monday, and 7 being Sunday). With the year number (2012, 2013, etc), the week number (01-53) and the day number (1-7) you can describe a day. Week number 1 of each year is the first week in a year that has the first Thursday of the year, or in other words, the week containing January 4th. Each year has 52 or 53 weeks and weeks always start on a Monday. Week numbers are defined in this same ISO 8601 standard. In the past few weeks I've seen a few bug reports in the PHP bug system ( 6560) that deal with another aspect of this same calendar: week numbers. In iOS however, week 01 starts on Monday, Decem(provided that you have set Monday as the first day of a week in your settings).Back in 2009 I wrote that PHP calendar implementation uses the ISO 8601 calendar for year numbers. If 1 January is on a Friday, it is part of week 53 of the previous year if on a Saturday, it is part of week 52 (or 53 if the previous year was a leap year) if on a Sunday, it is part of week 52 of the previous year.įurther more, if you search Google for "week number", at least the top 5 results follows the above ISO standard.įollowing this ISO standard, week 01 of 2016 starts on Monday, January 4 2016. If 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01.
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