A Digispark is used to evaluate a DCF77 module. The sketch is based on the InternalClockSync example the library
https://github.com/thijse/Arduino-DCF77/
It is modified to output the time to a software serial on pins P0 and P1. The library itself is needed in order for the sketch to work.
As the compiled sketch uses more flash than available with the bootlader, it must be programmed with an ISP, omitting the bootloader. I have used the ATtiny board definitions from
https://github.com/damellis/attiny/
P0: RX
P1: TX
P2: Time signal from DCF77
P3: P(ower)ON of DCF77 (will be set to LOW on setup to start the DCF module)