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DATE.md: Improve section on DST.

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Peter Hinch 2024-11-07 17:27:42 +00:00
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@ -87,6 +87,7 @@ This takes a single optional arg:
# Example usage # Example usage
The following code fragments illustrate typical usage:
```python ```python
from date import Date from date import Date
d = Date() d = Date()
@ -96,7 +97,7 @@ d.mday = 25 # Set absolute day of month
d.day += 7 # Advance date by one week. Month/year rollover is handled. d.day += 7 # Advance date by one week. Month/year rollover is handled.
today = Date() today = Date()
if d == today: # Date comparisons if d == today: # Date comparisons
print("Today")# do something print("Today") # do something
new_date = Date() new_date = Date()
new_date.day = d.day # Assign d to new_date: now new_date == d. new_date.day = d.day # Assign d to new_date: now new_date == d.
print(d) # Basic numeric print. print(d) # Basic numeric print.
@ -118,11 +119,11 @@ wday_last = d.wday_n(d.month_length) # Weekday of last day of month
``` ```
## DST ## DST
Common microcontroller practice is for system time to be UTC or local winter Common microcontroller practice is for system time to be permanently set to UTC
time. This avoids sudden changes which can disrupt continuously running or local winter time. This avoids sudden changes in system time which can
applications. Where local time is required the `time_offset` method accepts the disrupt continuously running applications. Where local time is required the
current UTC hours value (with fractional part) and returns an offset measured in `time_offset` method accepts the current UTC hours value (with fractional part)
hours. This may be used to facilitate a displayed local time value. and returns an offset measured in hours. This may be used to display local time.
The principal purpose of this module is to provide a lightweight `Date` class. The principal purpose of this module is to provide a lightweight `Date` class.
Time support is rudimentary, with the `time_offset` method illustrating a Time support is rudimentary, with the `time_offset` method illustrating a