The card does not say at what time of day to take such a bath – morning or evening. It gives the water temperature of 37–38 °C, the bath duration of 10–15 minutes and a course of 5–6 baths every other day.
General information (not a manufacturer's instruction): the time of the bath is chosen according to how you feel; with heart disease, high blood pressure or pregnancy, it is better to agree on the bath with a doctor.