Days, months, years in Vietnam is very diverse.Typically, each year has 365 days. However for 4 years, have had 366 days a year.A year has 12 months. May have 30 days and months have 31 days alternating with each other. However, February has 28 or 29 days.May day is the unit used to measure the effectiveness. It shows the progress of the human race. It helps more civilized life
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