The standard notation for this variant representing the day 1995-02-04 (that is day 035 of the year 1995) is Leap years are years with an additional day YYYY-02-29, where the year number is a multiple of four with the following exception: If a year is a multiple of 100, then it is only a leap year if it is also a multiple of 400.
For example, 1900 was not a leap year, but 2000 is one.
A week starts with Monday (day 1) and ends with Sunday (day 7).
In addition, these formats have several important advantages for computer usage compared to other traditional date and time notations.
The time notation described here is already the de-facto standard in almost all countries and the date notation is becoming increasingly popular.
In other words, the first week of a new year is the week that has the majority of its days in the new year.
Week 01 might also contain days from the previous year and the week before week 01 of a year is the last week (52 or 53) of the previous year even if it contains days from the new year.
For example, the 53 weeks of the worst case year 1976 started with 1975-12-29 = 1976-W01-1 and ended with 1977-01-02 = 1976-W53-7.
On the other hand, considering the lowest number of the last week of a year, the worst case is a non-leap year like 1999 that starts with a Friday, which ensures that the first three days of the year belong to the last week of the previous year.like 1/1/0), it has been suggested that the year 2000 is an excellent opportunity to change to the standard date notation.ISO 8601 is only specifying numeric notations and does not cover dates and times where words are used in the representation.All of these alternatives can easily and automatically be distinguished from each other: The hyphens can be omitted if compactness of the representation is more important than human readability, for example as in In commercial and industrial applications (delivery times, production plans, etc.), especially in Europe, it is often required to refer to a week of a year.Week 01 of a year is per definition the first week that has the Thursday in this year, which is equivalent to the week that contains the fourth day of January.2/4/95, 4/2/95, 95/2/4, 4.2.1995, 04-FEB-1995, 4-February-1995, and many more.