The sexual and reproductive health law in Spain went into force on Thursday, including the ability for women to take time from work when they get their period.
The bill proposed by the left-wing government's Gender Equality Ministry was adopted by parliament in February.
Since then, changes to the new law have been passed.
Barriers to abortion have been removed, making it more straightforward for trans people to change their gender.
After the February legislative vote, Equality Minister Irene Montero declared it a "historic day for advancing feminist rights."
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Menstrual leave is not a standard rule.
In German law, there is no analogous provision.
Women in Taiwan are only allowed to stay at home for three days each year and only receive half of their wage for doing so.
Employers in South Korea must provide their female employees one day off every month if they desire it, although the law does not specify who pays the employee's compensation.
Female workers in Spain must obtain a doctor's note to take menstruation leave.
In theory, the period of the leave from work is indefinite.
According to the legislation, it depends on how bad the menstrual discomfort is and how long it lasts.
The state bears the costs.
