Modern Chrono AddDays

Home › Date and Time (Chrono) › Chrono Date and Time › AddDays

AddDays

Adds days of exactly 24 hours, so the clock time can shift across a DST change.

Syntax

AddDays( 1 )

Notes

• exactly 86400 seconds. Does NOT keep the wall-clock

Examples

#import "std/chrono"
using chrono

'' EXACT arithmetic: 86400 seconds, which does NOT keep the wall-clock
'' time across a DST boundary. "24 hours from now".
dim as DateTime d = DateTime( 2026, 3, 7, 12, 0, 0, 0 )

print d.AddDays( 1 ).ToIsoString( )      '' 2026-03-08T12:00:00

'' The pair to compare it against is AddCalendarDays, which operates on
'' the civil fields instead. On a zoned value they differ twice a year,
'' and the names say which is which.

---

Library: Chrono Date and Time
Category: Date and Time (Chrono)
Documented under: Exact Arithmetic Vs Calendar Arithmetic