[#ASN1_TIME_diff]
= ASN1_TIME_diff
:mrdocs:

Compute the day and second difference between two ASN.1 time values.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_TIME_diff(
    int* pday,
    int* psec,
    xref:ASN1_TIME.adoc[ASN1_TIME] const* from,
    xref:ASN1_TIME.adoc[ASN1_TIME] const* to);
----

== Return Value

1 on success, or 0 if either time is invalid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pday*
| Receives the whole‐day difference (`to` minus `from);` may be NULL.
| *psec*
| Receives the remaining seconds difference beyond `pday;` may be NULL.
| *from*
| Starting time.
| *to*
| Ending time.
|===


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