date() = {year(), month(), day()}
datetime() = {{year(), month(), day()}, {hour(), minute(), second()}}
day() = pos_integer()
hour() = pos_integer()
minute() = non_neg_integer()
month() = pos_integer()
second() = non_neg_integer()
timestamp() = integer()
year() = pos_integer()
date2ts(X1::date()) -> timestamp()
datetime2ts(Datetime::datetime()) -> timestamp()
day_diff(TsA, TsB) -> any()
day_start(Ts) -> any()
foldl(F, Acc0, Start, End, X5) -> any()
hour_diff(TsA, TsB) -> any()
hour_start(Ts) -> any()
iso8601(Ts) -> any()
iso8601_basic(Ts) -> any()
map(F, Start, End, Period) -> any()
minute_diff(TsA, TsB) -> any()
minute_start(Ts) -> any()
month_start(Ts) -> any()
now2ms() -> any()
now2ms(X1) -> any()
now2ts() -> timestamp()
now2ts(X1) -> any()
now2us(X1) -> any()
range(Start, End, Interval) -> any()
second_diff(TsA, TsB) -> any()
shift(Ts, N, X3) -> any()
tomorrow(Ts) -> any()
ts2date(Timestamp::timestamp()) -> date()
ts2datetime(Timestamp::timestamp()) -> datetime()
week_start(Ts) -> any()
yesterday(Ts) -> any()
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