As an expert in the field of time and calendar systems, I can provide you with a detailed explanation of the 38th week of 2018 based on the information you've provided and common calendar practices.
The week number is a way of numbering the weeks of a year according to international standards. It is often used for planning purposes and to provide a standardized way of referring to a specific week within a year. The ISO week date system, for example, defines the first week of the year as the week that contains the first Thursday. This system ensures that each year has exactly 52 or 53 weeks.
According to the data you've provided, the 38th week of 2018 started on September 17, 2018 and ended on September 23, 2018. This means that during this week, there were seven days, from Monday to Sunday, which collectively made up the 38th week of the year 2018.
The significance of knowing the 38th week can vary. For some, it might be related to work schedules or planning events. For others, it could be about tracking progress on a project that spans several months. In any case, understanding the dates that correspond to a specific week number can be quite useful.
It's also worth noting that the week number system can differ between countries and contexts. While the ISO week date system is widely used, some countries might use a different system, which could lead to variations in the week numbers. However, the data provided aligns with the ISO system.
Now, let's move on to translating this explanation into Chinese.

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Week Numbers for 2018Week numberFrom DateTo DateWeek numberFrom DateTo DateWeek 37Sep. 10, 2018Sep. 16, 2018Week 38Sep. 17, 2018Sep. 23, 2018Week 39Sep. 24, 2018Sep. 30, 201851 more rowsread more >>