Why Does Go\'s `time.Parse()` Fail to Parse Timezone Identifiers Accurately?

Go's Time.Parse() Does Not Parse Timezone Identifiers

In the code provided, the time.Parse() function is used to parse a string into a time.Time object. However, the function does not parse the timezone identifier in the string, resulting in a time object that is not accurate.

According to the time.Parse() documentation, the default behavior of the function is to use the current location's timezone when encountering a zone abbreviation like MST. This explains why the first and third lines in the output are incorrect because the current location is set to CST. Specifically, the "EDT" string is interpreted as "Eastern Daylight Time," and the timezone's offset for CST is used, which is -0500.

To avoid this issue and correctly parse timezone identifiers, the time.ParseInLocation() function can be used. This function requires you to specify the location to be used when parsing the time string. In this case, the "America/New_York" location could be used to parse the "EDT" timezone identifier correctly.

Alternatively, a layout string in time.Parse() can be modified to explicitly specify the offset in the layout string itself, such as:

format := "2006 01 02 15:04 -0400 MST"
tn, _ := time.Parse(format, date)

Using one of these methods will ensure that time.Parse() accurately parses timezone identifiers and creates a time.Time object with the correct offset.

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