When is afternoon?

Have a date with a friend for a drink tonight. She promised to get back to me "in the afternoon" today to agree on time to meet. Five minutes ago I wikipediad "afternoon" to certify that it ends at six o'clock. While I was busy compiling a sarcastic message on the phone she texted me. Talk about timing. So now we're to meet at eight. Will be an interesting evening I'm sure.