Modern Chrono Instant IsValid

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Instant.IsValid

Returns true if the date-time is a real, in-range value; the only safe test.

Syntax

Instant.IsValid

Examples

#import "std/chrono"
using chrono

print DateTime( 2026, 8, 13 ).IsValid     '' true
print DateTime( 2025, 2, 30 ).IsValid     '' false -- no such date
print DateTime( 2026, 8, 13, 25, 0, 0, 0 ).IsValid       '' false

'' Out-of-range construction yields Invalid rather than raising

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