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CONFIG_APM_RTC_IS_GMT: RTC stores time in GMT

General informations

The Linux kernel configuration item CONFIG_APM_RTC_IS_GMT has multiple definitions:

found in drivers/sbus/char/Kconfig

The configuration item CONFIG_APM_RTC_IS_GMT:

Help text

Say Y here if your RTC (Real Time Clock a.k.a. hardware clock) stores the time in GMT (Greenwich Mean Time). Say N if your RTC stores localtime.

It is in fact recommended to store GMT in your RTC, because then you don't have to worry about daylight savings time changes. The only reason not to use GMT in your RTC is if you also run a broken OS that doesn't understand GMT.

RTC stores time in GMT found in arch/i386/Kconfig

The configuration item CONFIG_APM_RTC_IS_GMT:

Help text

Say Y here if your RTC (Real Time Clock a.k.a. hardware clock) stores the time in GMT (Greenwich Mean Time). Say N if your RTC stores localtime.

It is in fact recommended to store GMT in your RTC, because then you don't have to worry about daylight savings time changes. The only reason not to use GMT in your RTC is if you also run a broken OS that doesn't understand GMT.

Hardware

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