Why Does `SimpleDateFormat('yyyy-MM-dd'T'HH:mm:ss'Z'')` Show IST Instead of GMT/UTC?

SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'") with Z Date String Format

When using the SimpleDateFormat constructor, you have set the date format as "yyyy-MM-dd'T'HH:mm:ss'Z'". The 'Z' character at the end of the format string indicates that the date/time is in the UTC/GMT timezone. However, you have encountered an issue where the output is displaying IST time zone instead of GMT/UTC.

This occurs because you have not explicitly set the time zone for the SimpleDateFormat object. While the 'Z' character signifies a date in the UTC/GMT timezone, it does not automatically adjust the date/time object to that timezone. To ensure the correct timezone is applied, you need to set the time zone using the setTimeZone method.

Solution:

To resolve this issue, you can explicitly set the time zone to GMT/UTC using the following code:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));

By setting the time zone explicitly, the SimpleDateFormat object will accurately represent the date/time in the GMT/UTC timezone, and the output will display the correct time.

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