The dates of going to visit the grave may be adjusted slightly, forward or backward, if they would fall on a day when it is customary not to visit graves, as detailed below.

In a case where the visit to the grave would fall on a Shabbat, a festival, including the intermediate days, or on Purim, the mourner does not visit the grave on that day. Some visit a day earlier whereas others delay the visit until the next day when it is possible to visit the grave.

This applies to the visit to the grave at the end of the sheloshim or on the yahrzeit. As for the end of the shiva, everyone agrees that when this day falls on a Shabbat or festival, the visit is postponed to Sunday or the day after the festival and is not moved forward.

With regard to visiting the grave during the month of Nisan, as well as on Hanukkah and Rosh Hodesh, there are different opinions, and each person should follow the ruling of his rabbi.

If a person was not buried on the day of his passing, the first yahrzeit is observed, including the visit to the grave, on the anniversary of the burial, not of the death. In the following years the yahrzeit is observed on the date of the death. Some maintain that even the first yahrzeit is observed on the date of the death rather than the burial.

When the burial was delayed for more than three days after the death, all agree that even the first yahrzeit is held on the first anniversary of the burial.

The yahrzeit is the exact Hebrew date of the death or burial, not twelve months after the death. This means that if it was a leap year, which has thirteen months, the yahrzeit will be on the same day of the month as the death or burial of the previous year, despite the fact that, in actuality, thirteen months have passed.

In the case of one who died in the month of Adar of a regular year, in which there is only one month of Adar, the yahrzeit will always be observed in the first Adar, even in a leap year, which has two months of Adar. But if someone died in Adar of a leap year, in the subsequent leap years his yahrzeit will be observed on the date that he died: If he died in the first Adar, the yahrzeit will be in the first Adar, and if he passed away in the second Adar, it will be observed in the second Adar.