Jonny Steins app is a quick reference app that is used for knowing expiration dates displayed into Julian Calendar.
The app quickly references the following dates:
Roll dates: 22 days after X-Date
in DDMMMYY format to: 40 days after X-Date in DDMMMYY format
4 week to: 50 days after X-Date
in DDMMMYY format
Julian Roll: 158 days before X-Date
in Julian Date format YYDDD
to: 130 days before X-Date
in Julian Date format YYDDD
Born 180 OOD: 180 days before X-Date
in DDMMMYY format
Julian 180 OOD: 180 days before X-Date
in Julian Date format YYDDD