Between returns true if t is between a and b inclusive.

Ceil returns the result of rounding t up to a multiple of d (since the zero time).

IsMultiple returns true if t is some multiple of d (since the zero time).

MustParseISO8601D is like ParseISO8601D, but panics if there's an error.

NewRoundedTicker returns a new RoundedTicker.

Next returns the nearest multiple of d after t (since the zero time).

ParseISO8601D parses an ISO 8601 duration string.

Prev returns the nearest multiple of d before t (since the zero time).

Day duration.

truncate to second.

Week duration.

truncate to second.

ErrInt64Overflow is returned by ParseISO8601D if the duration can't fit in an int64.

RoundedTicker is like a time.Ticker, but rounded up to the nearest multiple of the tick Duration from the zero time.