A person vows 'I will not drink wine today.' When does the prohibition end?
'Today' in halachic context means the calendar day, which ends at nightfall. The vow is lifted when night begins.
Question 2
A person vows 'I will not eat meat this year' on the 29th of Elul (one day before Rosh Hashanah). How long is the prohibition?
The vow says 'this year' — even if only one day remains, it is binding for that day only. The new year begins fresh and the vow does not carry over.
Question 3
Someone vows 'until the kayitz (harvest)' while standing in a valley. When does the vow end?
Seasonal terms are interpreted by the locale of the vow. The valley has its own harvest season, which is what 'kayitz' means for a vow made there.
Question 4
A person vows 'not to drink wine until Rosh Chodesh Adar' in a regular (non-leap) year. When does the prohibition end?
A fixed calendar endpoint like Rosh Chodesh Adar is well-defined. The vow ends at the entry of that date. In a leap year, the question of which Adar would be unresolved.
Question 5
A husband tells his wife: 'You may not benefit from me from now until Pesach, if you visit your father's house.' She visits her father. What is the status of this arrangement?
Conditional spousal vows are valid. The condition (visiting father) and the duration (until Pesach) are both binding if the condition is fulfilled.