Arduino code to set time on Adafruit Feather m0 express. The code will ask you if you want to update the time in Serial and will allow you to enter the Date and time. This code came from the SDFat library example (Link: https://github.com/greiman/SdFat)
WaveHello/RTC_Setter
Arduino code to set time on Adafruit feather m0 express. This code is only a very slight modification to SDFat RTCTimestampTest example .
C++