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Arduino-RTC
Real-Time Clock (RTC) library for Arduino
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Arduino-RTC
Real-Time Clock (RTC) library for Arduino
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Go to the source code of this file.
Macros | |
| #define | DST_START_MONTH MARCH |
| #define | DST_END_MONTH NOVEMBER |
| #define | DST_START_WEEK 2 |
| #define | DST_END_WEEK 1 |
Functions | |
| int | usa_dst (const time_t *timer, int32_t *z) |
| #define DST_START_MONTH MARCH |
Daylight Saving function for the USA. To utilize this function, you must
and
Given the time stamp and time zone parameters provided, the Daylight Saving function must return a value appropriate for the tm structures' tm_isdst element. That is...
0: If Daylight Saving is not in effect. -1: If it cannot be determined if Daylight Saving is in effect.
A positive integer: Represents the number of seconds a clock is advanced for Daylight Saving. This will typically be ONE_HOUR.
Daylight Saving 'rules' are subject to frequent change. For production applications it is recommended to write your own DST function, which uses 'rules' obtained from, and modifiable by, the end user ( perhaps stored in EEPROM ).
1.8.11 
