https://habrahabr.ru/company/mailru/blog/242645/
   https://habrahabr.ru/company/at_consulting/blog/266681/
   http://tantek.com/2015/218/b1/use-timezone-offsets
   http://www.creativedeletion.com/2015/03/19/persisting_future_datetimes.html
   http://www.creativedeletion.com/2015/01/28/falsehoods-programmers-date-time-zones.html
   http://danilenko.org/2012/7/6/rails_timezones/
   https://www.w3.org/TR/timezone/
   https://robots.thoughtbot.com/its-about-time-zones
   https://robots.thoughtbot.com/a-case-study-in-multiple-time-zones
   http://stackoverflow.com/questions/19023978/should-mysql-have-its-timezone-set-to-utc
   http://serverfault.com/questions/191331/should-servers-have-their-timezone-set-to-gmt-utc
   http://stackoverflow.com/questions/1646171/mysql-datetime-fields-and-daylight-savings-time-how-do-i-reference-the-extra/1650910#1650910
   http://stackoverflow.com/questions/11587560/converting-negative-values-from-from-unixtime
   https://shafiqissani.wordpress.com/2010/09/30/how-to-get-the-current-epoch-time-unix-timestamp/
   https://youcanbook.me/blog/working-across-timezones/
   http://lifehacker.com/5782671/how-do-i-prevent-time-zone-mess-ups-while-traveling
   https://www.google.ru/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=%D0%BF%D0%B5%D1%80%D0%B5%D0%B4%D0%B0%D1%87%D0%B0+%D0%B2%D1%80%D0%B5%D0%BC%D0%B5%D0%BD%D0%B8+%D1%85%D0%B0%D0%B1%D1%80&newwindow=1&start=10
   https://habrahabr.ru/post/274811/
   https://habrahabr.ru/post/274905/
   https://habrahabr.ru/post/308532/
   https://habrahabr.ru/company/postgrespro/blog/308442/
   https://habrahabr.ru/company/postgrespro/blog/302200/
   https://habrahabr.ru/company/postgrespro/blog/278019/
   https://habrahabr.ru/company/postgrespro/blog/275755/
   https://google.github.io/styleguide/jsoncstyleguide.xml#Date_Property_Values
   https://habrahabr.ru/post/278527/
   https://en.wikipedia.org/wiki/ISO_8601
   http://blog.untrod.com/2016/08/actually-understanding-timezones-in-postgresql.html
   http://stackoverflow.com/questions/4117249/what-time-zone-does-hibernate-use-when-it-reads-and-writes-a-java-calendar-objec
   http://stackoverflow.com/questions/2532729/daylight-saving-time-and-time-zone-best-practices
   http://stackoverflow.com/questions/21193516/hibernate-not-providing-date-in-utc-timezone
   http://stackoverflow.com/questions/508019/jpa-hibernate-store-date-in-utc-time-zone
   http://peter-on-java.blogspot.ru/2012/04/reading-and-writing-utc-timestamps-to.html