Bom (Tag-based PE function)

Return a timestamp for midnight on the first day of the month from a given time expression.

Syntax

Bom(t1)

Arguments

t1

A time expression

Returns

Timestamp for the start of the month.

Exceptions

None

Notes

This function is useful for establishing a time at a unique clock time independent of the length of particular days.

Example

Bom('*')

• [Return a timestamp for midnight on the first day of this month.]

  Bom(PrevEvent('att1', '*'))

• [Return a timestamp for midnight on the first day of the month when 'att1' had a value before the current one.]

  Bom(FindEq('att1', '-60d', '*', 50))

• [Return a timestamp for midnight on the first day of the month when the value of 'att1' was first equal to 50 in the past 60 days.]