What's the difference between いつだって and いつでも?

Question

Pretty simple, like the title says, what's the difference between いつだって and いつでも? I can tell there's a little difference, but it's so very difficult for me to pin down.

Answer 1

「いつだって」 is a more casual way of saying 「いつでも」 and it has a little emphasis on its meaning compared to 「いつでも」. You'll hardly see 「だって」 being used in newspaper articles compared to 「でも」.

だって　source: デジタル大辞泉 (http://dictionary.goo.ne.jp/leaf/jn2/137401/m0u/)

［係助］《断定の助動詞「だ」に係助詞「とて」の付いた「だとて」の音変化という》名詞・副詞、一部の助詞に付く。「でも」に似るが、語調がより強い。

Also this might be of your interest: http://dictionary.goo.ne.jp/leaf/thsrs/17174/m0u/