This chapter provides reference material for the time manager.
Time Manager Data Structures
Time Manager Functions
The header file DateTime.h declares the API that this chapter describes. For more information on the time manager, see the section "Time" in the Palm OS Programmer's Companion, vol. I.
Time Manager Data Structures

The time manager uses these structures to store information.
DateFormatType

The DateFormatType enum specifies the different display formats for date values.
typedef enum {
dfMDYWithSlashes,
dfDMYWithSlashes,
dfDMYWithDots,
dfDMYWithDashes,
dfYMDWithSlashes,
dfYMDWithDots,
dfYMDWithDashes,
dfMDYLongWithComma,
dfDMYLong,
dfDMYLongWithDot,
dfDMYLongNoDay,
dfDMYLongWithComma,
dfYMDLongWithDot,
dfYMDLongWithSpace,
dfMYMed,
dfMYMedNoPost,
dfMDYWithDashes
} DateFormatType;
Value Descriptions
dfMDYWithSlashes |
The month, day, and year numbers separated by slashes. For example, 12/31/95.
This is considered a short format. |
dfDMYWithSlashes |
The day, month, and year numbers separated by slashes. For example, 31/12/95.
This is considered a short format. |
dfDMYWithDots |
The day, month, and year numbers separated by dots. For example, 31.12.95.
This is considered a short format. |
dfDMYWithDashes |
The day, month, and year numbers separated by dashes. For example, 31-12-95.
This is considered a short format. |
dfYMDWithSlashes |
The year, month, and day numbers separated by slashes. For example, 95/12/31.
This is considered a short format. |
dfYMDWithDots |
The year, month, and day numbers separated by dots. For example, 95.12.31.
This is considered a short format. |
dfYMDWithDashes |
The year, month, and day numbers separated by dashes. For example, 95-12-31.
This is considered a short format. |
dfMDYLongWithComma |
The month, day, and year in long format, with a comma. For example, Dec 31, 1995.
This is considered a long format. |
dfDMYLong |
The month, day, and year in long format. For example, 31 Dec 1995.
This is considered a long format. |
dfDMYLongWithDot |
The month, day, and year in long format, with a dot. For example, 31. Dec 1995.
This is considered a long format. |
dfDMYLongNoDay |
The month and year in long format. For example, Dec 1995.
This is considered a long format. |
dfDMYLongWithComma |
The day, month, and year in long format, with a comma. For example, 31 Dec, 1995.
This is considered a long format. |
dfYMDLongWithDot |
The year, month, and day in long format with dot separators. For example, 1995.12.31.
This is considered a long format. |
dfYMDLongWithSpace |
The year, month, and day in long format with space separators. For example, 1995 Dec 31.
This is considered a long format. |
dfMYMed |
The month in long format with the two-digit year, preceded by an apostrophe. For example, Dec '95.
This is considered a medium format. |
dfMYMedNoPost |
The month in long format with the two-digit year. For example, Dec 95.
This is considered a medium format. |
dfMDYWithDashes |
The month, day, and year numbers separated by dashes. For example, 12-31-95.
This is considered a short format. |
Compatibility
The dfMDYWithDashes constant is defined in Palm OS® 4.0 and higher.
DateTimeType

The DateTimeType structure represents a date and time value.
typedef struct{
Int16 second;
Int16 minute;
Int16 hour;
Int16 day;
Int16 month;
Int16 year;
Int16 weekDay;
} DateTimeType
typedef DateTimeType *DateTimePtr;
Field Descriptions
second |
The number of seconds. This is a value between 0 and 59. |
minute |
The number of minutes. This is a value between 0 and 59. |
hour |
The number of hours. This is a value between 0 and 23. |
day |
The day number. This is a value between 1 and 31. |
month |
The month number. This is a value between 1 and 12. |
year |
The year number. |
weekDay |
The day number. This represents the number of days since Sunday and is thus a value between 0 and 6. |
DateType

The DateType structure represents a date value.
typedef struct{
UInt16 year :7;
UInt16 month :4;
UInt16 day :5;
} DateType;
typedef DateType *DatePtr;
Field Descriptions
year |
The number of years since 1904.
Note that this is the format used on Macintosh computers. |
month |
The month number. This is a value between 1 and 12. |
day |
The day number. This is a value between 1 and 31. |
DaylightSavingsTypes

The DaylightSavingsTypes enum specifies the different forms of daylight savings times that you can specify for date and time values.
Note that the table uses "DST" to represent daylight savings time.
typedef enum {
dsNone,
dsUSA,
dsAustralia,
dsWesternEuropean,
dsMiddleEuropean,
dsEasternEuropean,
dsGreatBritain,
dsRumania,
dsTurkey,
dsAustraliaShifted
} DaylightSavingsTypes;
Value Descriptions
dsNone |
No DST (daylight savings time) |
dsUSA |
U.S.A. DST |
dsAustralia |
Australian DST |
dsWesternEuropean |
Western European DST |
dsMiddleEuropean |
Middle European DST |
dsEasternEuropean |
Eastern European DST |
dsGreatBritain |
Great Britain and Eire DST |
dsRumania |
Rumanian DST |
dsTurkey |
Turkish DST |
dsAustraliaShifted |
Australian DST, with the 1986 shift |
Compatibility
If 4.0 New Feature Set is present, this data type is obsolete. In versions 4.0 and higher, Palm OS represents daylight savings time as an integer value that gives the number of minutes to add to the current time for daylight savings time.
DayOfMonthType

The DayOfMonth enum specifies the different day-of-the-week numeric values that are returned by the DayOfMonth function. These values are used to represent repeating appointments that occur on specific days of the month; for example, the first Friday or the third Tuesday of each month.
typedef enum {
dom1stSun, dom1stMon, dom1stTue, dom1stWen,
dom1stThu, dom1stFri, dom1stSat,
dom2ndSun, dom2ndMon, dom2ndTue, dom2ndWen,
dom2ndThu, dom2ndFri, dom2ndSat,
dom3rdSun, dom3rdMon, dom3rdTue, dom3rdWen,
dom3rdThu, dom3rdFri, dom3rdSat,
dom4thSun, dom4thMon, dom4thTue, dom4thWen,
dom4thThu, dom4thFri, dom4thSat,
domLastSun, domLastMon, domLastTue,
domLastWen, domLastThu, domLastFri,
domLastSat
} DayOfWeekType;
Value Descriptions
dom1stSun |
The first Sunday of the month. |
dom1stMon |
The first Monday of the month. |
dom1stTue |
The first Tuesday of the month. |
dom1stWen |
The first Wednesday of the month. |
dom1stThu |
The first Thursday of the month. |
dom1stFri |
The first Friday of the month. |
dom1stSat |
The first Saturday of the month. |
dom2ndSun |
The second Sunday of the month. |
dom2ndMon |
The second Monday of the month. |
dom2ndTue |
The second Tuesday of the month. |
dom2ndWen |
The second Wednesday of the month. |
dom2ndThu |
The second Thursday of the month. |
dom2ndFri |
The second Friday of the month. |
dom2ndSat |
The second Saturday of the month. |
dom3rdSun |
The third Sunday of the month. |
dom3rdMon |
The third Monday of the month. |
dom3rdTue |
The third Tuesday of the month. |
dom3rdWen |
The third Wednesday of the month. |
dom3rdThu |
The third Thursday of the month. |
dom3rdFri |
The third Friday of the month. |
dom3rdSat |
The third Saturday of the month. |
dom4thSun |
The fourth Sunday of the month. |
dom4thMon |
The fourth Monday of the month. |
dom4thTue |
The fourth Tuesday of the month. |
dom4thWen |
The fourth Wednesday of the month. |
dom4thThu |
The fourth Thursday of the month. |
dom4thFri |
The fourth Friday of the month. |
dom4thSat |
The fourth Saturday of the month. |
domLastSun |
The last Sunday of the month. |
domLastMon |
The last Monday of the month. |
domLastTue |
The last Tuesday of the month. |
domLastWen |
The last Wednesday of the month. |
domLastThu |
The last Thursday of the month. |
domLastFri |
The last Friday of the month. |
domLastSat |
The last Saturday of the month. |
Compatibility
On Palm OS versions earlier than 4.0, this type was named DayOfWeekType.
TimeFormatType

The TimeFormatType enum specifies the different display formats for time values.
typedef enum
{
tfColon,
tfColonAMPM,
tfColon24h,
tfDot,
tfDotAMPM,
tfDot24h,
tfHoursAMPM,
tfHours24h,
tfComma24h,
} TimeFormatType;
typedef TimeFormatType *TimeFormatPtr;
Value Descriptions
tfColon |
The hour and minutes separated by a colon character. For example, 1:00. |
tfColonAMPM |
The hour and minutes separated by a colon and followed by an AM/PM indication. For example, 1:00 pm. |
tfColon24h |
The 24-hour time with the hour and minutes separated by a colon character. For example, 13:00. |
tfDot |
The hour and minutes separated by a dot character. For example, 1.00. |
tfDotAMPM |
The hour and minutes separated by a period and followed by an AM/PM indication. For example, 1.00 pm. |
tfDot24h |
The 24-hour time with the hour and minutes separated by a dot character. For example, 13.00. |
tfHoursAMPM |
The hour value followed by an AM/PM indication. For example, 1 pm. |
tfHours24h |
The 24-hour value, followed by an AM/PM indication. For example, 13. |
tfComma24h |
The 24-hour time with the hour and minutes separated by a comma character. For example, 13,00. |
TimeType

The TimeType structure represents a time value.
typedef struct {
UInt8 hours;
UInt8 minutes;
} TimeType;
typedef TimeType *TimePtr;
Field Descriptions
hours |
The number of hours. This is a value between 0 and 23. |
minutes |
The number of minutes. This is value between 0 and 59. |
Time Manager Constants

The following table shows the constants that represent the maximum lengths of strings returned by the date and time formatting routines DateToAscii, DateToDOWDMFormat, and TimeToAscii.
Constant |
Value |
Description |
dateStringLength |
9 |
Maximum length of the string returned by DateToAscii for short date formats. |
longDateStrLength |
15 |
Maximum length of the string returned by DateToAscii for medium and long date formats. |
timeStringLength |
9 |
Maximum length of the string returned by TimeToAscii. |
dowDateStringLength |
19 |
Maximum length of the string returned by DateToDOWDMFormat for short date formats. |
dowLongDateStrLength |
25 |
Maximum length of the string returned by DateToDOWDMFormat for both medium and long date formats. |
Time Manager Functions

DateAdjust

Purpose
Return a new date +/- the days adjustment.
Prototype
void DateAdjust (DatePtr dateP, Int32 adjustment)
Parameters
<-> dateP | A pointer to a DateType structure with the date to be adjusted. |
-> adjustment | The number of days by which to adjust the date. |
Result
Returns nothing. Upon return, dateP contains the adjusted date.
Comments
This function advances the date and manages month and year wrapping conditions.
See Also
TimAdjust
DateDaysToDate

Purpose
Converts a date specified as the number of days since January 1, 1904 to a DateType structure.
Prototype
void DateDaysToDate (UInt32 days, DatePtr date)
Parameters
-> days | The number of days since 1/1/1904. |
<-> date | A pointer to a DateType structure that is updated with the computed date values. |
Result
Returns nothing. Upon return, the date information is returned in the structure referenced by the date parameter.
See Also
DateSecondsToDate, DateToDays
DateSecondsToDate

Purpose
Converts a date specified as the number of seconds since January 1, 1904 to a DateType structure.
Prototype
void DateSecondsToDate (UInt32 seconds, DatePtr date)
Parameters
-> seconds | The number of seconds since 1/1/1904. |
<- date | A pointer to a DateType structure that is updated with the computed date values. |
Result
Returns nothing. The structure referenced by the date parameter is updated with the date information.
See Also
DateDaysToDate, DateToDays
DateTemplateToAscii

Purpose
Convert the specified date values into a string that is formatted according to a formatting template specification.
Prototype
UInt16 DateTemplateToAscii (const Char *templateP, UInt8 months, UInt8 days, UInt16 years, Char *stringP, Int16 stringLen)
Parameters
-> templateP | A pointer to the template string used to format the date. The maximum length of this string is maxDateTemplateLen bytes, excluding the null terminator character. |
| See the Comments section below for details on how to specify date formatting in this template string. |
-> months | The month number, which must be a value between 1 and 12. |
-> days | The day number, which must be a value between 1 and 31. |
-> years | The four-digit year number. For example, 1995. |
<- stringP | A pointer to a string that is updated with the result. |
| If stringP is NULL, this function does not write an output string; however, it does return the length required for the output string. |
| If stringP is not NULL, this function writes the formatted string to stringP, writing up to stringSize bytes into stringP. |
-> stringLen | The size of the stringP buffer. |
Result
The length of the formatted string, without the terminating NULL byte.
The DateTemplateToAscii returns the required length of the formatted string even if the stringP parameter is NULL; this allows you to determine the buffer size at runtime.
Comments
This function is intended as a replacement for the DateToAscii and DateToDOWDMFormat functions.
This function uses the formatting template referenced by templateP to create a formatted string from the date values that you pass in.
You specify a series of formatting substrings in templateP. Each substring has the form:
^<valueType><formatModifier>
Each substring has three components:
The ^ character begins a substring.
The <valueType> component is a single-digit value that specifies the value type.
The <formatModifier> component is a single-letter value that specifies how you want that value formatted.
The following is an example of a template specification with three substrings:
^0z ^2l ^4r
Table 53.1 shows the values you can specify for the <valueType> component. Note that the formatted result depends on the <modifier> value.
Table 53.1 Template value types for the DateTemplateToAscii function
Value |
Value type |
Formatted examples |
0 |
Day number |
1, 01, 23, 31 |
1 |
Day name |
Tue, Tuesday |
2 |
Month name |
May, Aug, August |
3 |
Month number |
4, 04, 11 |
4 |
Year number |
97, 1997 |
Table 53.2 shows the values you can specify for the <modifier> component of each template substring.
Table 53.2 Template modifier types for the DateTemplateToAscii function
Modifier |
Description |
s |
Formats the value in short form |
r |
Formats the value in regular form |
l |
Formats the value in long form |
z |
Adds a leading zero to the formatted numeric value |
Finally, Table 53.3 shows examples of each value type formatted with each modifier type.
Table 53.3 Examples of formatted values
Value type |
Raw value |
s (Short format) |
r (Regular format) |
l (Long format) |
z (Zero format) |
0 (Day number) |
2 |
2 |
2 |
2 |
02 |
1 (Day name) |
2 |
T |
Tue |
Tuesday |
n/a |
2 (Month name) |
11 |
N |
Nov |
November |
n/a |
3 (Month number) |
11 |
11 |
11 |
11 |
11 |
4 (Year number) |
2000 |
00 |
2000 |
2000 |
n/a |
For example, calling DateTemplateToAscii as follows:
DateTemplateToAscii("^0z ^2l ^4r", 2, 7,
2000, myStr, 20)
Produces the following formatted string:
07 February 2000
Compatibility
Implemented only if 3.5 New Feature Set is present. To use this function in code intended to be run on earlier versions of Palm OS, link with the PalmOSGlue library and call DateGlueTemplateToAscii. For more information, see Chapter 76, "PalmOSGlue Library."
See Also
DateToAscii, DateToDOWDMFormat
DateToAscii

Purpose
Convert the passed date to a string using the format specified by the dateFormat parameter.
Prototype
void DateToAscii (UInt8 months, UInt8 days, UInt16 years, DateFormatType dateFormat, Char *pString)
Parameters
-> months | The month number, which must be a value between 1 and 12. |
-> days | The day number, which must be a value between 1 and 31. |
-> years | The four-digit year number. For example, 1995. |
<- pString | A pointer to string that is updated with the result. |
| This string must be of length dateStringLength for short formats or longDateStrLength for medium or long formats. Note that these lengths do include the terminating NULL byte. For more information about required string lengths, see Time Manager Constants. |
Result
Returns nothing. The string reference by pString is updated with the formatted string.
Comments
If you are using a debug ROM, the string buffer is filled with either dateStringLength or longStrLength debugging bytes, depending on the value of the dateFormat parameter.
It is important to allocate enough space for your string buffer. Finding buffer overflow errors can be difficult when using a debug ROM. One common situation is when you pass a buffer that is too small from a form, for an element such as a label or title. Then, the buffer overflow can clobber objects that follow the form in memory. When a form element's location information is corrupted, it disappears from the display.
Note that you can use the DateTemplateToAscii function instead of this function if the 3.5 feature set is present. You can call the DateTemplateToAscii function with a NULL string buffer to predetermine the required size for your buffer.
See Also
TimeToAscii, DateToDOWDMFormat, DateTemplateToAscii
DateToDays

Purpose
Convert the DateType structure to the number of days elapsed from January 1, 1904.
Prototype
UInt32 DateToDays (DateType date)
Parameters
Result
Returns the number of days elapsed from January 1, 1904 to the specified date.
See Also
DateDaysToDate
DateToDOWDMFormat

Purpose
Convert a date to a formatted string using the format specified by the dateFormat parameter. The resultant string includes the name of the day of the week.
Prototype
void DateToDOWDMFormat (UInt8 months, UInt8 days, UInt16 years, DateFormatType dateFormat, Char *pString)
Parameters
-> months | The month number, which must be a value between 1 and 12. |
-> days | The day number, which must be a value between 1 and 31. |
-> years | The four-digit year number. For example, 1995. |
<- pString | A pointer to a string that is updated with the result. The string must be of length dowDateStringLength for short formats or dowLongDateStrLength for medium or long date formats. See Time Manager Constants for string buffer lengths. |
Result
Returns nothing. The string referenced by pString is updated with the formatted string.
Comments
The values of some of the Time Manager Constants that specify the required string buffer lengths do change from time to time. You should always use the constants or verify the required lengths by checking the datetime.h file.
It is important to allocate enough space for your string buffer. Finding buffer overflow errors can be difficult when using a debug ROM. One common situation is when you pass a buffer that is too small from a form, for an element such as a label or title. Then, the buffer overflow can clobber objects that follow the form in memory. When a form element's location information is corrupted, it disappears from the display.
Note that you can use the DateTemplateToAscii function instead of this function if the 3.5 feature set is present. You can call the DateTemplateToAscii function with a NULL string buffer to predetermine the required size for your buffer.
Compatibility
On Palm OS 3.1 Japanese ROMs, this function contains a bug that prevented it from properly displaying 4-byte long day names. To prevent this bug from affecting your application, use DateGlueToDOWDMFormat in the PalmOSGlue library instead of calling this function directly. For more information, see Chapter 76, "PalmOSGlue Library."
See Also
DateToAscii, DateTemplateToAscii
DayOfMonth

Purpose
Return a value that represents the day of a month on which the specified date occurs. The value represents a quantity such as "First Monday" or "Third Friday" as is used for repeating appointments in the Datebook.
Prototype
Int16 DayOfMonth (Int16 month, Int16 day, Int16 year)
Parameters
-> month | The month number, which must be a value between 1 and 12. |
-> day | The day number, which must be a value between 1 and 31. |
-> year | The four-digit year number. For example, 1995. |
Result
Returns a value that represents day of the month. This value is one of the DayOfMonthType values.
Comments
The returns value can be used to specify on which day of the month an appointment repeats.
DayOfWeek

Purpose
Return the day of the week value for a specified date.
Prototype
Int16 DayOfWeek (Int16 month, Int16 day, Int16 year)
Parameters
-> month | The month number, which must be a value between 1 and 12. |
-> day | The day number, which must be a value between 1 and 31. |
-> year | The four-digit year number. For example, 1995. |
Result
Returns one of the following values for the day of the week of the specified date, as shown in the following table:
Day name |
Returned day value |
Sunday |
0 |
Monday |
1 |
Tuesday |
2 |
Wednesday |
3 |
Thursday |
4 |
Friday |
5 |
Saturday |
6 |
DaysInMonth

Purpose
Return the number of days in the month.
Prototype
Int16 DaysInMonth (Int16 month, Int16 year)
Parameters
-> month | The month number, which must be a value between 1 and 12. |
-> year | The four-digit year number. For example, 1995. |
Result
Returns the number of days in the month for the specified year.
TimAdjust

Purpose
Return a new date, with the time adjusted by the specified number of seconds.
Prototype
void TimAdjust (DateTimePtr dateTimeP, Int32 adjustment)
Parameters
<-> dateTimeP | A pointer to a DateType structure. |
-> adjustment | The number of seconds by which to adjust the time. |
Result
Returns nothing. The structure referenced by dateTimeP is modified to contain the updated date and time.
Comments
This function advances the time by the specified number of seconds and takes care of any wraparound conditions.
See Also
DateAdjust
TimDateTimeToSeconds

Purpose
Return the number of seconds elapsed from 12:00 A.M. on January 1, 1904 to the specified date and time.
Prototype
UInt32 TimDateTimeToSeconds (DateTimePtr dateTimeP)
Parameters
Result
The number of seconds elapsed from 12:00 A.M. on January 1, 1904 to the date referenced by dateTimeP.
See Also
TimSecondsToDateTime
TimGetSeconds

Purpose
Return the current date and time of the device in seconds since 12:00 A.M. on January 1, 1904.
Prototype
UInt32 TimGetSeconds (void)
Parameters
Result
The number of seconds elapsed from 12:00 A.M. on January 1, 1904 to the current date and time on the device.
See Also
TimSetSeconds
TimGetTicks

Purpose
Return the tick count since the last reset. The tick count does not advance while the device is in sleep mode.
Prototype
UInt32 TimGetTicks (void)
Parameters
Result
Returns the tick count.
Comments
You can call the SysTicksPerSecond routine to determine the number of ticks per second.
See Also
SysTicksPerSecond
TimSecondsToDateTime

Purpose
Converts a date specified as the number of seconds since January 1, 1904 to a DateTimeType structure.
Prototype
void TimSecondsToDateTime (UInt32 seconds, DateTimePtr dateTimeP)
Parameters
-> seconds | A date specified as the number of seconds elapsed from 12:00 A.M. on January 1, 1904 to the date |
<- dateTimeP | A pointer to a DateTimeType structure that is updated with the date and time values. |
Result
Returns nothing. The structure referenced by dateTimeP is updated with the date and time computed for the number of seconds since 12:00 A.M. on January 1, 1904.
See Also
TimDateTimeToSeconds
TimSetSeconds

Purpose
Set the clock of the device to the date and time passed as the number of seconds since 12:00 A.M. on January 1, 1904.
Prototype
void TimSetSeconds (UInt32 seconds)
Parameters
-> seconds | The number of seconds since 12:00 A.M. on January 1, 1904. |
Result
Returns nothing.
Comments
On systems with the Notification Feature Set is present, this function broadcasts the sysNotifyTimeChangeEvent to all interested parties. See Chapter 40, "Notification Manager." for more information.
See Also
TimGetSeconds
TimeToAscii

Purpose
Convert the time to a string that is formatted according to the specified timeFormat.
Prototype
void TimeToAscii (UInt8 hours, UInt8 minutes, TimeFormatType timeFormat, Char *pString)
Parameters
-> hours | The number of hours. This must be a value between 0 and 23. |
-> minutes | The number of minutes. This must be a value between 0 and 59. |
-> timeFormat | The time format for the resultant string. This must be one of the TimeFormatType values. |
<- pString | A pointer to a string that is updated with the resultant string. This string must be of length timeStringLength. |
Result
Returns nothing. The string referenced by pString is updated with the formatted string.
Comments
If you are using a debug ROM in Palm OS 3.5, the string buffer is filled with timeStringLength debugging bytes.
It is important to allocate enough space for your string buffer. Finding buffer overflow errors can be difficult when using a debug ROM. One common situation is when you pass a buffer that is too small from a form, for an element such as a label or title. Then, the buffer overflow can clobber objects that follow the form in memory. When a form element's location information is corrupted, it disappears from the display.
See Also
DateToAscii
New TimeZoneToAscii

Purpose
Convert a time zone to a string.
Prototype
void TimeZoneToAscii (Int16 timeZone, const LmLocaleType *localeP, Char *string)
Parameters
-> timeZone | A pointer to the time zone, given as minutes east of Greenwich Mean Time (GMT). |
-> localeP | A pointer to a locale (see LmLocaleType) that identifies the time zone country. You can use the constant lmAnyLanguage as the value for the language field of the structure pointed to by this parameter. |
<- string | A pointer to a string in which to return the result. This string must be of length timeZoneStringLength. |
Result
Returns nothing.
Comments
This function returns a descriptive string for the specified time zone. This string identifies the time zone first by its country, such as "USA (Mountain)" or "Canada (Eastern)." If the function cannot find a time zone that matches the specified GMT offset and country, it returns a string containing the time zone as a numeric offset from the GMT (for example, "GMT+9:00").
Compatibility
Implemented only if 4.0 New Feature Set is present.
New TimTimeZoneToUTC

Purpose
Converts a date and time from a given time zone to Universal Coordinated Time (UTC). UTC is also known as Greenwich Mean Time (GMT).
Prototype
UInt32 TimTimeZoneToUTC (UInt32 seconds, Int16 timeZone, Int16 daylightSavingAdjustment)
Parameters
-> seconds | The number of seconds since 12:00 A.M. on January 1, 1904. |
-> timeZone | The time zone, given as the number of minutes east of UTC. For time zones west of UTC but before the international dateline, this is a negative number. |
-> daylightSavingAdjustment | The number of minutes to add to the current time for daylight savings time in this time zone. |
Result
Returns the same time as seconds but in the Universal Coordinated Time. The value is still given as the number of seconds since 12:00 A.M. on January 1, 1904.
Comments
The returned value is not necessarily the time in Greenwich because Greenwich may be observing daylight saving time.
You can use this function to convert the local time to UTC. The time zone and the daylight savings adjustment are system preferences that can be retrieved using PrefGetPreference. For example, the following code converts the current local time to UTC:
Int16 timeZone =
PrefGetPreference(prefTimeZone);
Int16 daylightSavingAdjustment =
PrefGetPreference(
prefDaylightSavingAdjustment);
UInt32 utcTime =
TimTimeZoneToUTC(TimGetSeconds(), timeZone,
daylightSavingAdjustment);
Compatibility
Implemented only if 4.0 New Feature Set is present.
See Also
TimUTCToTimeZone
New TimUTCToTimeZone

Purpose
Converts a date and time from Universal Coordinated Time (UTC) to the specified time zone. UTC is also known as Greenwich Mean Time (GMT).
Prototype
UInt32 TimUTCToTimeZone (UInt32 seconds, Int16 timeZone, Int16 daylightSavingAdjustment)
Parameters
-> seconds | The number of seconds since 12:00 A.M. on January 1, 1904 in UTC. |
-> timeZone | The time zone, given as the number of minutes east of UTC. For time zones west of UTC before the international dateline, this is a negative number. |
-> daylightSavingAdjustment | The number of minutes to add to the current time for daylight savings time in this time zone. |
Result
Returns the same time as seconds but in the specified time zone. The value is still given as the number of seconds since 12:00 A.M. on January 1, 1904.
Comments
The seconds value is not necessarily the time in Greenwich because Greenwich may be observing daylight saving time.
Compatibility
Implemented only if 4.0 New Feature Set is present.
See Also
TimTimeZoneToUTC
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