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< p > Given a string < code > date< / code > representing a < a href = "https://en.wikipedia.org/wiki/Gregorian_calendar" target = "_blank" > Gregorian calendar< / a > date formatted as < code > YYYY-MM-DD< / code > , return < em > the day number of the year< / em > .< / p >
< p > < / p >
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< p > < strong class = "example" > Example 1:< / strong > < / p >
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< pre >
< strong > Input:< / strong > date = " 2019-01-09"
< strong > Output:< / strong > 9
< strong > Explanation:< / strong > Given date is the 9th day of the year in 2019.
< / pre >
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< p > < strong class = "example" > Example 2:< / strong > < / p >
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< pre >
< strong > Input:< / strong > date = " 2019-02-10"
< strong > Output:< / strong > 41
< / pre >
< p > < / p >
< p > < strong > Constraints:< / strong > < / p >
< ul >
< li > < code > date.length == 10< / code > < / li >
< li > < code > date[4] == date[7] == ' -' < / code > , and all other < code > date[i]< / code > ' s are digits< / li >
< li > < code > date< / code > represents a calendar date between Jan 1< sup > st< / sup > , 1900 and Dec 31< sup > th< / sup > , 2019.< / li >
< / ul >
