The Yahrzeit (anniversary of the date of passing) is observed annually on the Jewish date of death. When death occurs after sunset, it is the following day that is used to calculate the Yahrzeit.
The Yahrzeit begins at sunset on the preceding day and is concluded at sunset of the day of death. During the observance of the Yahrzeit, a memorial Yahrzeit candle is kept burning and the Mourner’s Kaddish is recited during services in the Synagogue. (from www.yahrtzeit.com )
To calculate a Yahrzeit, please use one of the following links;
CLICK on the link below to convert Hebrew/English dates