[#OPENSSL_gmtime_diff]
= OPENSSL_gmtime_diff
:mrdocs:

Compute the day/second difference between two broken‐down UTC times.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OPENSSL_gmtime_diff(
    int* pday,
    int* psec,
    tm const* from,
    tm const* to);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pday*
| Receives the whole‐day difference (`to` ‐ `from).`
| *psec*
| Receives the remaining second difference after whole days are removed.
| *from*
| Starting time (UTC).
| *to*
| Ending time (UTC).
|===


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