Feast day
The memory of Sts Jonas is celebrated every year on March 29. Last feast was on a Saturday. Next feast in 2026 will be a Sunday on 8 months 3 weeks.
Fast
fasting day with wine and oil permitted (oinou kai elaiou)
The Sts Jonas Day is not a fasting day per se, but in 2025 the date of March 29 falls within a fasting period.
Take a look at the ephemeris of the day to see other saints and given names celebrated on the same day.