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66589d930bf2d334fef22a1a1584ec233da7cb7b
[etc/awesome.git] / tzinfo.lua
1 local tz_info_methods = { }
2 local tz_info_mt = {
3         __index = tz_info_methods ;
4 }
5
6 -- Binary search
7 local function _find_current ( tzinfo , target , i , j )
8         if i >= j then return j end
9
10         local half = math.ceil ( (j+i) / 2 )
11
12         if target > tzinfo [ half ].transition_time then
13                 return _find_current ( tzinfo , target , half , j )
14         else
15                 return _find_current ( tzinfo , target , i , half-1 )
16         end
17 end
18 function tz_info_methods:find_current ( current )
19         return self [ _find_current ( self , current , 0 , #self ) ].info
20 end
21
22 function tz_info_methods:localize ( utc_ts )
23         utc_ts = utc_ts or gettime ( )
24         return utc_ts + self:find_current ( utc_ts ).gmtoff
25 end
26
27 return {
28         tz_info_mt = tz_info_mt ;
29 }