using interrupt allowed?

[RogMoe]

Hi Marvin,
I plan to use the library to control 4 shutters independently, using conditional statements and time of day. It's going to be a mega2560 doing some other small tasks like reading the energymeter, switching some lights around the house etc. No other domotica involved. I prefer to use a DCF77 receiver so time is always accurate. The DCF77 library uses an interrupt. I read that using delays is not preferred. Does the same go for interrupts?