Re: [PATCH] EmbeddedPkg/TimeBaseLib: Add function to get Week day.

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

On 31 May 2018 at 19:02, Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com> wrote:
> This patch add function EfiTimeToWday() which returns
> day of the week.
>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
> Signed-off-by: Vabhav <vabhav.sharma@nxp.com>

Please use your full name in the S-o-b line

Also, do you need this patch for upcoming edk2-platforms changes? If
so, please mention that, otherwise it is unclear why we need this
change.


> ---
>  EmbeddedPkg/Include/Library/TimeBaseLib.h     |  8 ++++++
>  EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c | 38 ++++++++++++++++++++++++---
>  2 files changed, 43 insertions(+), 3 deletions(-)
>
> diff --git a/EmbeddedPkg/Include/Library/TimeBaseLib.h b/EmbeddedPkg/Include/Library/TimeBaseLib.h
> index fe3618e..dd0b99f 100644
> --- a/EmbeddedPkg/Include/Library/TimeBaseLib.h
> +++ b/EmbeddedPkg/Include/Library/TimeBaseLib.h
> @@ -65,4 +65,12 @@ EfiTimeToEpoch (
>    IN  EFI_TIME  *Time
>    );
>
> +/**
> +  returns Day of the week [0-6] 0=Sunday
> + **/
> +UINTN
> +EfiTimeToWday (
> +  IN  EFI_TIME  *Time
> +  );
> +
>  #endif
> diff --git a/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c b/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c
> index 0c0d940..5f2bf65 100644
> --- a/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c
> +++ b/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c
> @@ -77,11 +77,11 @@ EpochToEfiTime (
>  }
>
>  /**
> -  Converts EFI_TIME to Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC)
> +  Calculate Epoch days
>   **/
>  UINTN
>  EFIAPI
> -EfiTimeToEpoch (
> +EfiGetEpochDays (
>    IN  EFI_TIME  *Time
>    )
>  {
> @@ -90,7 +90,6 @@ EfiTimeToEpoch (
>    UINTN m;
>    UINTN JulianDate;  // Absolute Julian Date representation of the supplied Time
>    UINTN EpochDays;   // Number of days elapsed since EPOCH_JULIAN_DAY
> -  UINTN EpochSeconds;
>
>    a = (14 - Time->Month) / 12 ;
>    y = Time->Year + 4800 - a;
> @@ -101,11 +100,44 @@ EfiTimeToEpoch (
>    ASSERT (JulianDate >= EPOCH_JULIAN_DATE);
>    EpochDays = JulianDate - EPOCH_JULIAN_DATE;
>
> +  return EpochDays;
> +}
> +/**
> +  Converts EFI_TIME to Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC)
> + **/
> +UINTN
> +EFIAPI
> +EfiTimeToEpoch (
> +  IN  EFI_TIME  *Time
> +  )
> +{
> +  UINTN EpochDays;   // Number of days elapsed since EPOCH_JULIAN_DAY
> +  UINTN EpochSeconds;
> +
> +  EpochDays = EfiGetEpochDays (Time);
> +
>    EpochSeconds = (EpochDays * SEC_PER_DAY) + ((UINTN)Time->Hour * SEC_PER_HOUR) + (Time->Minute * SEC_PER_MIN) + Time->Second;
>
>    return EpochSeconds;
>  }
>
> +/**
> +  returns Day of the week [0-6] 0=Sunday
> + **/
> +UINTN
> +EfiTimeToWday (
> +  IN  EFI_TIME  *Time
> +  )
> +{
> +  UINTN EpochDays;   // Number of days elapsed since EPOCH_JULIAN_DAY
> +
> +  EpochDays = EfiGetEpochDays (Time);
> +
> +  // 4=1/1/1970 was a Thursday
> +
> +  return (EpochDays + 4) % 7;
> +}
> +
>  BOOLEAN
>  EFIAPI
>  IsLeapYear (
> --
> 1.9.1
>