new_period (second = 90, minute = 5)
# 5 minutes and 90 seconds
new_period(day = -1)
# -1 days
new_period(second = 3, minute = 1, hour = 2, day = 6, week = 1)
# 13 days, 2 hours, 1 minute and 3 seconds
new_period(hour = 1, minute = -60)
# 1 hour and -60 minutes
new_period(second = 0)
# 0 seconds
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