Easy getcandle question

[futurenets]

can anyone describe what's happening (preferable with an example) in the following code.

s1, e1 = core.getcandle(source:barSize(), core.now(), 0, 0);
s2, e2 = core.getcandle("D1", core.now(), 0, 0);

Size1 = (e1-s1)*Period;
Size2 = (e2-s2)*365;

[Apprentice]

first line
returns the start and end date for the current candle

second line
returns the start and end date for the current day.

Size1 will have a length of Period Chart Candle
Size2 will have the length of 365 days...