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This library contains next public exported methods:

• utc_to_local(DateTime, Timezone) – converts UTC time to local according to specified Timezone
• local_to_utc(DateTime, Timezone) – converts local time to UTC
• local_to_local(DateTime, TimezoneFrom, TimezoneTo) – converts local time to local
• tz_name(DateTime, Timezone) – returns a timezone name (E.g. MSK, MSD, etc)
• tz_shift(DateTime, Timezone) – returns time difference between local datetime and GMT
• tz_shift(DateTime, TimezoneFrom, TimezoneTo) – returns time difference between local datetime and required timezone
  Where
  DateTime = {date(), time()}
  TimeZone(To, From) = String(). E.g. “Europe/Moscow”, “America/NewYork”. Or abbreviations “MSK”, “MSD”, etc. Note:
  abbreviation is just used to find appropriate timezone name. If you want to convert “MSK” → “PDT”, but source timezone
  is not in daylight saving, it will be corrected by library and “MSK” → “PST” conversion will be made.

Examples:

>localtime:utc_to_local({{2010, 7, 22}, {17, 56, 23}, "Europe/Moscow"). 
{{2010,10,10},{21,56,23}} 

>localtime:local_to_utc({{2010, 10, 10}, {21, 56, 23}}, "Europe/Moscow").        
{{2010,10,10},{17,56,23}} 

>localtime:local_to_local({{2010, 10, 10}, {21, 56, 23}}, "Europe/Moscow", "Australia/Sydney"). 
{{2010,10,11},{3,56,23}} 

>localtime:tz_name({{2010, 10, 10}, {21, 56, 23}}, "Europe/Moscow"). 
{"MSD","MSD"} 

>localtime:tz_name({{2010,10,11},{3,56,23}}, "Australia/Sydney").                  
{"EST","EST"} 

>localtime:tz_shift({{2010,12,18},{21,35,34}}, "Europe/Moscow").
{'+',3,0}

>localtime:tz_shift(calendar:local_time(), "Europe/Moscow", "Asia/Tokyo").
{'+',6,0}