Modern Chrono DateTime StartOfWeek

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DateTime.StartOfWeek

Returns midnight on the first day of the week, Monday unless told otherwise.

Syntax

DateTime.StartOfWeek( firstDay = DT_MONDAY )

Examples

#import "std/chrono"
using chrono

dim as DateTime d = DateTime( 2026, 8, 13, 14, 30, 5, 123 )
'' Defaults to MONDAY, the ISO convention
print d.StartOfWeek( ).ToIsoString( )               '' 2026-08-10T00:00:00
print d.StartOfWeek( ).DayOfWeek                    '' 1

'' Or name the day the week starts on
print d.StartOfWeek( DT_SUNDAY ).ToIsoString( )     '' 2026-08-09T00:00:00

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Library: Chrono Date and Time
Category: Date and Time (Chrono)
Documented under: The Members