-fix date formatting and add tests

[sbenedicadb]

#435

[shalehaha]

i'm a little bit concerned about removing the locale. it might generate the numbers in another language.

[shalehaha]

Is that handled by ISO8601DateFormatter ?

[yangyansong-adbe]

Should we use DateFormatter instead of ISO8601DateFormatter?
When working with fixed format dates, such as RFC 3339, you set the dateFormat property to specify a format string. For most fixed formats, you should also set the locale property to a POSIX locale ("en_US_POSIX"), and set the timeZone property to UTC.
-- from Apple

Here is my sample code:

let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZ"
print(formatter.string(from: Date()))
//2020-10-29T12:52:42-0600

[codecov]

Codecov Report

Merging #434 into dev will increase coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #434      +/-   ##
==========================================
+ Coverage   87.14%   87.43%   +0.30%     
==========================================
  Files          92       92              
  Lines        4042     4042              
==========================================
+ Hits         3522     3534      +12     
+ Misses        520      508      -12     

[sbenedicadb]

@shalehaha quick! while it's green!