Incorrect time formatting

[jspri]

FormatDateTime is unsafe!

It uses the formatting string dateTimeFormat = "2006-01-02T15:04:05.99Z" which essentially just appends the Z character onto the user's local time.

Possible fixes:

• Swap the format string to "2006-01-02T15:04:05.99Z07:00" or maybe even time.RFC3339 (probably breaking)
• Explicitly cast to UTC time (maybe breaking - but probably just bug fixing)

func FormatDateTime(value time.Time) string {
      return value.UTC().Format(dateTimeFormat)
 }

• Document that the function should be called with a UTC time (probably too conservative)

Not sure what your original intentions were so I'll leave this to you.

I originally found this after spending an hour or so debugging why calls to cloudwatch.GetMetricData weren't returning any data in the v2 aws SDK.