Timezone editor lets you easily add or modify time zone information in Windows registry.The time zone information is used by operating system, on "Date/Time property" dialog->"Time zone" tab,you can find time zone list, Timezone editor can add or modify the data in the list.

Why we need to edit time zone data in windows registry?see FAQ

To use this function

Click Popupmenu, and then choose "Tools"-> "Timezone Editor"

Before adding or modifying time zone data ,you should backup time zone data in Windows registry first: press "Backup" button and choose a file name then press "OK".When you want to restore time zone data,just press "Restore" and find the file then press "OK".

Field Explain :

• "key name" unique key in Windows registry .
• "Display name" Display string in dropdown list.
• "Daylight saving name" Specifies a string associated with daylight time on this operating system. For example, this member could contain “PDT” to indicate Pacific Daylight Time. This string is not used by the operating system,and this string can be empty.
• "Standard name"Specifies a string associated with standard time on this operating system. For example, this member could contain “EST” to indicate Eastern Standard Time. This string is not used by the operating system,and this string can be empty.
• "Bias"Specifies the time zone current bias, in minutes, for local time translation on this computer. The bias is the difference, in minutes, between Coordinated Universal Time (UTC) and local time. All translations between UTC and local time are based on the following formula: UTC = local time + bias This member is required.
• "Standard bias"Specifies a bias value to be used during local time translations that occur during standard time. This member is ignored if daylight saving time is disabled. This value is added to the value of the Bias member to form the bias used during standard time. In most time zones, the value of this member is zero.
• "Daylight saving bias"Specifies a bias value to be used during local time translations that occur during daylight time. This member is ignored if daylight saving time is disabled. This value is added to the value of the Bias member to form the bias used during daylight time. In most time zones, the value of this member is –60.
• "Daylight saving date time "Specifies a SYSTEMTIME structure that contains a date and local time when the transition from standard time to daylight time occurs on this time zone.
• "Standard date time "Specifies a date time that contains a date and local time when the transition from daylight time to standard time occurs on this time zone.

Modify exist time zone data step:

• Click "Timezone" dropdown list and choose the time zone you want to modify.
• Do not modify "key name" field.
• You can freely modify "Display name" field, "Daylight saving name" field and "Standard name" field with any word you like.
• "Bias" field is very important.Read the description of "Bias" field carefully then modify it.
• modify "Standard Bias" field and "Daylight saving" field.
• Read the description of "Daylight saving date time " and "Standard date time " carefully then modify it.
• Press "Save" button.

Add a new time zone data step:

• Click "New" button.
• Do modify "key name" field,and make it unique key name on this system.
• You can freely modify "Display name" field, "Daylight saving name" field and "Standard name" field with any word you like.
• "Bias" field is very important.Read the description of "Bias" field carefully then modify it.
• modify "Standard Bias" field and "Daylight saving" field.
• Read the description of "Daylight saving date time " and "Standard date time " carefully then modify it.
• Press "Save" button.