# Functions
BeginningOfDay truncate time day.
BeginningOfHour truncate time hour.
EndOfDay get the last time of day.
FormatAnalyticsTime 格式化.
GetAnalyticsTimeUnit 时间划分工具.
TimeQuantum 获取时间区间，例：近3天.
# Constants
AnalyticsTimeUnitDay day.
AnalyticsTimeUnitHour hour.
AnalyticsTimeUnitMonth month.
AnalyticsTimeUnitYear year.