Modern Chrono DateTime AddDays

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DateTime.AddDays

Returns the date-time moved by days of exactly 24 hours, fractions allowed.

Syntax

DateTime.AddDays

Examples

#import "std/chrono"
using chrono

'' EXACT arithmetic -- 86400 seconds per day, and the argument is a
'' DOUBLE, so fractions are allowed
dim as DateTime d = DateTime( 2026, 8, 13, 14, 30, 5, 123 )

print d.AddDays( 1 ).Day             '' 14
print d.AddDays( 0.5 ).Hour          '' 2 -- half a day later, next morning
print d.AddDays( -13 ).ToIsoString( )            '' 2026-07-31T14:30:05.1230000

'' "Same time tomorrow" across a DST boundary is AddCalendarDays

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