src/timetable: Add rfc_3339 method

diff --git a/src/timetable.lua b/src/timetable.lua
index 9b78576787c1585eafd80b2fccfb8ef8292a2fa9..c71c59bc25d737ebc27c60b0586b719dd1d25c8f 100644 (file)
--- a/src/timetable.lua
+++ b/src/timetable.lua
@@ -134,8 +134,14 @@ function timetable_methods:timestamp ( )
        return timestamp ( unpack_tm ( self ) )
 end
 
+function timetable_methods:rfc_3339 ( )
+       -- %06.4g gives 3 (=6-4+1) digits after decimal
+       return strformat ( "%04u-%02u-%02uT%02u:%02u:%06.4g" , unpack_tm ( self ) )
+end
+
 local timetable_mt = {
        __index    = timetable_methods ;
+       __tostring = timetable_methods.rfc_3339 ;
        __eq = function ( a , b )
                return a:timestamp() < b:timestamp()
        end ;