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252 lines
4.2 KiB
252 lines
4.2 KiB
/*++
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Copyright (C) Microsoft Corporation, 1997 - 1998
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All rights reserved.
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Module Name:
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time.cxx
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Abstract:
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time related functions.
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Author:
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Steve Kiraly (SteveKi) 18-Dec-1997
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--*/
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#include "precomp.hxx"
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#pragma hdrstop
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#include "time.hxx"
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#include "persist.hxx"
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/*++
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Routine Name:
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GetTimeZoneBias
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Routine Description:
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Returns the time zone bias.
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Arguments:
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Nothing.
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Return Value:
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Value of the time zone specific bias.
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--*/
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LONG
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lGetTimeZoneBias(
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VOID
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)
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{
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LONG lBias;
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TIME_ZONE_INFORMATION tzi;
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//
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// Get the time zone specific bias.
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//
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switch( GetTimeZoneInformation( &tzi ) ){
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case TIME_ZONE_ID_DAYLIGHT:
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lBias = (tzi.Bias + tzi.DaylightBias);
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break;
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case TIME_ZONE_ID_STANDARD:
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lBias = (tzi.Bias + tzi.StandardBias);
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break;
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case TIME_ZONE_ID_UNKNOWN:
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lBias = tzi.Bias;
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break;
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default:
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DBGMSG(DBG_ERROR, ("GetTimeZoneInformation failed: %d\n", GetLastError()));
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lBias = 0;
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break;
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}
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return lBias;
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}
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/*++
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Routine Name:
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SystemTimeToLocalTime
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Routine Description:
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Converts the system time in minutes to local time in minutes.
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Arguments:
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System time in minutes to convert.
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Return Value:
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The converted local time in minutes if sucessful,
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otherwize returns the original system time.
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--*/
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DWORD
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SystemTimeToLocalTime(
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IN DWORD Minutes
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)
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{
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//
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// Ensure there is no wrap around. Add a full day to
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// prevent biases
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//
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Minutes += (24*60);
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//
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// Adjust for bias.
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//
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Minutes -= lGetTimeZoneBias();
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//
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// Now discard extra day.
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//
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Minutes = Minutes % (24*60);
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return Minutes;
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}
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/*++
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Routine Name:
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LocalTimeToSystemTime
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Routine Description:
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Converts the local time in minutes to system time in minutes.
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Arguments:
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Local time in minutes to convert.
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Return Value:
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The converted system time in minutes if sucessful,
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otherwize returns the original local time.
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--*/
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DWORD
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LocalTimeToSystemTime(
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IN DWORD Minutes
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)
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{
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//
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// Ensure there is no wrap around. Add a full day to
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// prevent biases
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//
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Minutes += (24*60);
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//
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// Adjust for bias.
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//
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Minutes += lGetTimeZoneBias();
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//
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// Now discard extra day.
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//
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Minutes = Minutes % (24*60);
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return Minutes;
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}
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/*++
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Routine Name:
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bGetTimeFormatString(
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Routine Description:
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Get the time format string for the time picker
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control without the second specifier.
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Arguments:
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Refernece to string class where to return string.
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Return Value:
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TRUE format string returned. FALSE error occurred.
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--*/
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BOOL
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bGetTimeFormatString(
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IN TString &strFormatString
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)
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{
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//
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// Setup the time picker controls to use a short time format with no seconds.
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//
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TCHAR szTimeFormat[MAX_PATH] = {0};
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TCHAR szTimeSep[MAX_PATH] = {0};
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LPTSTR pszTimeFormat = szTimeFormat;
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BOOL bStatus = FALSE;
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if( GetLocaleInfo( LOCALE_USER_DEFAULT,
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LOCALE_STIMEFORMAT,
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szTimeFormat,
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COUNTOF(szTimeFormat)) &&
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GetLocaleInfo( LOCALE_USER_DEFAULT,
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LOCALE_STIME,
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szTimeSep,
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COUNTOF(szTimeSep)))
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{
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INT cchTimeSep = _tcslen(szTimeSep);
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TCHAR szShortTimeFormat[MAX_PATH];
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LPTSTR pszShortTimeFormat = szShortTimeFormat;
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//
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// Remove the seconds format string and preceeding separator.
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//
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while (*pszTimeFormat)
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{
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if ((*pszTimeFormat != TEXT('s')) && (*pszTimeFormat != TEXT('S')))
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{
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*pszShortTimeFormat++ = *pszTimeFormat;
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}
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else
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{
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*pszShortTimeFormat = TEXT('\0');
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bTrimString(szShortTimeFormat, TEXT(" "));
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bTrimString(szShortTimeFormat, szTimeSep);
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pszShortTimeFormat = szShortTimeFormat + lstrlen(szShortTimeFormat);
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}
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pszTimeFormat++;
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}
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*pszShortTimeFormat = TEXT('\0');
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bStatus = strFormatString.bUpdate( szShortTimeFormat );
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}
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return bStatus;
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}
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