Modern Chrono DateTime AddCalendarDays

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DateTime.AddCalendarDays

Returns the same clock time a number of days later, even across a DST change.

Syntax

DateTime.AddCalendarDays( n )

Examples

#import "std/chrono"
using chrono

dim as DateTime d = DateTime( 2026, 8, 13, 14, 30, 5, 123 )
'' "Same time tomorrow": walks the civil date and re-resolves the
'' offset, so the wall-clock time survives a DST boundary where
'' AddDays( 1 ) -- exactly 86400 seconds -- would shift it
print d.AddCalendarDays( 1 ).ToIsoString( )      '' 2026-08-14T14:30:05.1230000

'' With no offset attached there is nothing to re-resolve, so the two
'' agree exactly
print d.HasOffset            '' false

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