Power Query
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Date
Date.AddDays
Date.AddMonths
Date.AddQuarters
Date.AddWeeks
Date.AddYears
Date.Day
Date.DayOfWeek
Date.DayOfWeekName
Date.DayOfYear
Date.DaysInMonth
Date.EndOfDay
Date.EndOfMonth
Date.EndOfQuarter
Date.EndOfWeek
Date.EndOfYear
Date.From
Date.FromText
Date.IsInCurrentDay
Date.IsInCurrentMonth
Date.IsInCurrentQuarter
Date.IsInCurrentWeek
Date.IsInCurrentYear
Date.IsInNextDay
Date.IsInNextMonth
Date.IsInNextNDays
Date.IsInNextNMonths
Date.IsInNextNQuarters
Date.IsInNextNWeeks
Date.IsInNextNYears
Date.IsInNextQuarter
Date.IsInNextWeek
Date.IsInNextYear
Date.IsInPreviousDay
Date.IsInPreviousMonth
Date.IsInPreviousNDays
Date.IsInPreviousNMonths
Date.IsInPreviousNQuarters
Date.IsInPreviousNWeeks
Date.IsInPreviousNYears
Date.IsInPreviousQuarter
Date.IsInPreviousWeek
Date.IsInPreviousYear
Date.IsInYearToDate
Date.IsLeapYear
Date.Month
Date.MonthName
Date.QuarterOfYear
Date.StartOfDay
Date.StartOfMonth
Date.StartOfQuarter
Date.StartOfWeek
Date.StartOfYear
Date.ToRecord
Date.ToText
Date.WeekOfMonth
Date.WeekOfYear
Date.Year
Time.EndOfHour
Time.StartOfHour
Date Time
Date Time Zone
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Date.StartOfMonth

Date.StartOfMonth

Returns the first value of the month.
function (optional dateTime as nullable any) as nullable any

Description

Returns the first value of the month given a date or datetime type.

Category

Date

Examples

Find the start of the month for October 10th, 2011, 8:10:32AM (#datetime(2011, 10, 10, 8, 10, 32)).
Date.StartOfMonth(#datetime(2011, 10, 10, 8, 10, 32))

datetime(2011, 10, 1, 0, 0, 0)

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Date.StartOfMonth
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