Johan de Groot | Antichaos

Category: blog-en

  • Year-to-date in Tableau

    If you want to compare last year to this year ‘to date’, you have to take into account that a leap-year adds 1 extra date to the year – so you can’t just compare the day-of-year from this and last year.

    Often this filter is used:

    DATEPART('dayofyear',[Date]) <= DATEPART('dayofyear',TODAY())

    But this is a better one, since this compares day and month:

    YEAR([Date]) >= YEAR(TODAY())-1
AND (MONTH([Date]) < MONTH(TODAY())
OR
(MONTH([Date]) == MONTH(TODAY())
AND DAY([Date]) <= DAY(TODAY())))

    If you want to have a ‘year to date’ until today (so today excluded), use this one:

    YEAR([Date]) >= YEAR(TODAY()-1)-1
AND (MONTH([Date]) < MONTH(TODAY()-1)
OR
(MONTH([Date]) == MONTH(TODAY()-1)
AND DAY([Date]) <= DAY(TODAY()-1)))

  • Calculate last day of month

    Sometimes you need to calculate how many days a certain month – like the current month. With some nested date-calculations this isn’t that hard to calculate…

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