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arch/nrf91: convert GNSS UTC time with timegm() not mktime()

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The GNSS datetime reported by the modem is UTC. mktime() interprets the
broken-down time as local time, so a configured timezone would skew the
reported epoch. Use timegm() to convert it directly as UTC.

Signed-off-by: raiden00pl <raiden00@railab.me>
This commit is contained in:
raiden00pl 2026-06-12 19:15:41 +02:00 • committed by Xiang Xiao
parent 2bcc59b42f
commit 3a8d4ba3dd
1 changed files with 8 additions and 2 deletions
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10
arch/arm/src/nrf91/nrf91_modem_gnss.c
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@ -223,7 +223,8 @@ static bool nrf91_gnss_isactive(int cfun)
*
* Description:
* Configure and start the GNSS engine. The caller must have verified that
* the modem is in a GNSS-capable functional mode (see nrf91_gnss_isactive).
* the modem is in a GNSS-capable functional mode
* (see nrf91_gnss_isactive).
*
****************************************************************************/
@ -510,7 +511,12 @@ static void nrf91_gnss_pvt_event(struct nrf91_gnss_s *priv)
tm.tm_isdst = 0;
gps.timestamp = timestamp;
gps.time_utc = mktime(&tm);
/* The GNSS datetime is UTC; use timegm() (not mktime(), which would
* apply the local timezone) to convert it to epoch seconds.
*/
gps.time_utc = timegm(&tm);
gps.latitude = priv->pvt.latitude;
gps.longitude = priv->pvt.longitude;
gps.altitude = priv->pvt.altitude;