Gmt Local Time

Gmt Local Time

Current local time in USA – California – San Francisco. Get San Francisco's weather and area codes, time zone and DST. PDT (Pacific Daylight Time) UTC/GMT -7. View current local time in different places around the world. Customize the clocks by choosing a continent and viewing its time zones. Daylight Saving Time is automatic. » Greenwich Mean Time to Local Time Main Conversion Page. Scale:. Is local time not Right? Input the time zone below to convert: » GMT to Worldwide Timezone Converters. Greenwich Mean Time Offset: UTC +0. 12:00 PM Greenwich Mean Time conversion to worldwide times: Adelaide. Athens. 3:00 PM. 0:00 AM Next Day. Greenwich Mean Time ( GMT ) to Your Local Time and Worldwide Time Conversions, Conversion Time Chart between Greenwich Mean Time and Local Time. This time zone converter lets you visually and very quickly convert GMT to EST and vice-versa. Simply mouse over the colored hour-tiles and glance at the hours selected by the column. GMT stands for Greenwich Mean Time.

Gmt Local Time

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Converting Between Local Time And GMT (UTC) Time

There is no built-in way to convert between a Local Time and Greenwich Mean Time (GMT, also called UTC or Zulu Time). Moreover, Windows and VB/VBA support three different methods of representing time. The three different time formats are described below:

Serial Format
This format represents time in a Double type variable. The integer portion (to the left of the decimal point) represents the number of days since 30-December-1899 (1 = 31-December-1899, 2 = 1-January-1900,..39075 = 23-December-2006)., and the fractional portion of the value (to the right of the decimal point) represents a fraction of a 24-hour day (0.25 = 6:00:00, 0.5 = 12:00:00, 0.75 = 18:00:00). This is the format used in VB/VBA's time-related functions.

FILETIME
The FILETIME is a Type comprised of two 32-bit Long integers, which together form a 64-bit integer (not supported in VB/VBA). The value of the FILETIME is the number of 100-nanosecond intervals since 1-January-1601. The system uses FILETIME structures to store the date attributes of a file. These dates and times are stored as GMT values. The FILETIME Type is shown below:

SYSTEMTIME
The SYSTEMTIME is a Type with an element for each component of a date and time (i.e., year, month, day, hour, minute, second). The SYSTEMTIME Type is shown below:

There is also an obsolete time format called DosDateTime, which is not discussed here. See this MSDN article form information about the DosDateTime format. For a discussion of file times in general, see this MSDN article.

You can download a bas code module or a complete workbook that contains the following functions.

The first pair of functions convert between Local Time and GMT. Daylight Savings Time is taken into account. The rules for Daylight Savings Time in these function are the USA rules. Other countries may have other rules. You can adapt the code to match your local rules. In the USA, for years before 2007, Daylight Savings Time begins on the first Sunday in April and Standard Time begins on last Sunday in October. For years 2007 and later, Daylight Savings Time begins on the second Sunday in March, and Standard Time begins on the first Sunday of November.

The downloadable module contains a procedure call IsDateWithinDST which returns True or False indicating whether the specified date is within the Daylight Saving Time period.

To determine the GMT of a Local Time (and the reverse) the GetTimeZoneInformation Windows API function is used. It fills a TIME_ZONE_INFORMATION Type with information about the current time zone, its offset from GMT, and information about Daylight Savings Time. The TIME_ZONE_INFORMATION Type is show below:

NOTE: If you are using the Windows API Text Viewer program, you will need to change the declaration of StandardName and DaylightName form StandardName(32) As Integer to StandardName(0 to 31) As Integer, and DaylightName(32)As Integer to DaylightName(0 to 31) As Integer, as is shown above. The declarations in the API Text Viewer are incorrect.


The
GetTimeZoneInformation Windows API function populates the element of this Type. Here, Bias is the number of minutes that are added to the local time to get GMT. In the USA Central Time Zone, this value is 360 minutes, or 6 hours. Conversion is based on the following two relationships:Eve online download.

These relationships do not reflect Daylight Savings Time, since GMT does not change with Daylight Time. To accomodate Daylight Time,

The IsDateWithinDST function is included in the download module.

The Type stores the StandardName and DaylightName as an array of integers. To convert these arrays to strings, use the code below:

You can the call this function with code like

The ConvertTimeZoneName function is included in the downloadable module. The function CurrentTimeZoneName will return a string containing the name of the current time zone.

The downloadable workbook also contains the following functions specifically designed to be called from worksheet cells, in a module named modWorksheetFunctions.

CreatedFileDateTime:

This function returns the Created File Time of the file specified in FileName. If this file does not exist, the function returns #VALUE. If FileName is omitted, the function returns the created time of ThisWorkbook. By default, the time returned is the local time value. To return the GMT value, set the TimeAsGMT flag to True.

AccessedFileDateTime:

This function returns the Last Access (read) File Time of the file specified in FileName. If this file does not exist, the function returns #VALUE. If FileName is omitted, the function returns the last access time of ThisWorkbook. By default, the time returned is the local time value. To return the GMT value, set the TimeAsGMT flag to True.

ModifiedFileDateTime:

This function returns the Last Modified (write) File Time of the file specified in FileName. If this file does not exist, the function returns #VALUE. If FileName is omitted, the function returns the last access time of ThisWorkbook. By default, the time returned is the local time value. To return the GMT value, set the TimeAsGMT flag to True.

CurrentTimeZoneName:

This function returns the name of the current time zone, e.g., 'Central Standard Time'.


IsCurrentlyDaylightTime:

This function returns True if the system is currently operating in Daylight Savings Time, or False otherwise.

GMTBias:

This returns the number of minutes that are to be added to a Local Time to get GMT. This value is positive for locations West of GMT, or negative for locations East of GMT. The relationship between Local Time and GMT is expressed in code as

The other function listed above convert between Serial Dates and FILETIMEs and SYSTEMTIMEs. To convert between FILETIMEs and SYSTEMTIMEs, use the SystemTimeToFileTime and FileTimeToSystemTime Windows API functions. The function declarations are shown below, and the procedures are documented online at MSDN:
SystemTimeToFileTime


FileTimeToSystemTime


You can download the bas module file here or a complete workbook with examples here.


Windows System API Functions

The time value and format functions in the module file are built up from the following Window API Functions. Each API function name below is linked to the documentation page in the MSDN (Microsoft Developer Network) Library. You can view to the main MSDN Library page here.

This function converts a GMT FILETIME to a Local FILETIME.


LocalFileTimeToFileTime

This function converts a Local FILETIME to a GMT FILETIME.

This function converts a SYSTEMTIME to a FILETIME.


FileTimeToSystemTime

This function converts a FILETIME to a SYSTEMTIME.


GetTimeZoneInformation

This function retrieves Time Zone Information indicating Time Zone and Daylight Savings Time information.

Function Reference Table. Use the following functions to convert between file times or get current times.

FromToFunction (modLocalTimeAndGMT function or Windows API function)
Local Serial GMT SerialLocalTimeToGMTTimeSerial module function
GMT Serial Local SerialGMTTimeToLocalTimeSerial module function
SYSTEMTIME SerialSystemTimeToSerialTime module function
FILETIME Serial FileTimeToSerialTime module function
SerialFILETIMESerialTimeToFileTime module function
Serial SYSTEMTIMESerialTimeToSystemTime module function
FILETIME SYSTEMTIMEFileTimeToSystemTime API Function
SYSETMTIME FILETIMESystemTimeTFileTile API Function
Local FILETIME GMT FILETIMEFileTimeLocalToFileTimeGMT module function
GMT FILETIME Local FILETIMEFileTimeGMTToFileTimeLocal module function
Local SYSTEMTIME GMT SYSTEMTIME LocalSystemTimeToGMTSystemTime module function
GMT SYSTEMTIME Local SYSTEMTIME GMTSystemTimeToLocalSystemTime module function
Local Time Now As Serial n/aLocalTimeNowAsSerial module function
GMT Time Now As Serial n/aGMTNowAsSerial module function
Local Time Now As FILETIME n/aLocalTimeNowAsFILETIME module function
GMT Time Now As FILETIME n/aGMTNowAsFILETIME module function
Local Time Now As SYSTEMTIME n/aLocalTimeNowAsSYSTEMTIME module function
GMT Time Now As SYSTEMTIME n/aGMTNowAsSYSTEMTIME module function
Is a date within Daylight Time n/aIsDateWithinDST module function
GmtGmt Local Time

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Created By Chip Pearson and Pearson Software Consulting, LLC
This Page: Updated: November 06, 2013
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