Why Does the Time Format Layout '2006-01-02' Seem Confusing in Go?

Understanding the Layout of '2006-01-02' in Go's time.Format Function

In Go, the time.Format function allows you to customize the formatting of a time value. Among the possible layouts is '2006-01-02,' which seems confusing because it appears to be only three numbers.

Behind the Layout: Reading the Reference Time

The key to understanding this layout lies in understanding the "reference time" referenced in the documentation. This reference time is:

Jan 2 15:04:05 2006 MST

Each element in this reference time corresponds to a position in the layout string. For example:

• '1' maps to the month of the year (January)
• '2' corresponds to the day of the month (2nd)
• '2006' represents the year (2006)

Meaning of '2006', '01', and '02' in the Layout

Therefore, in the layout '2006-01-02':

• '2006' represents the year ('20' in our reference time)
• '01' represents the month (January) which is '1' in our reference time
• '02' corresponds to the day of the month (2nd day)

By following this mapping, you can interpret other layout strings as well. For instance, '2006-09-19' is September 19, 2006, and '1999-02-12' is February 12, 1999.

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