Starting Daylight Saving Time

Working with Dates and Times in Python

Max Shron

Data Scientist and Author

Start of Daylight Saving Time

spring_ahead_159am = datetime(2017, 3, 12, 1, 59, 59)
spring_ahead_159am.isoformat()

'2017-03-12T01:59:59'

spring_ahead_3am = datetime(2017, 3, 12, 3, 0, 0)
spring_ahead_3am.isoformat()

'2017-03-12T03:00:00'

(spring_ahead_3am - spring_ahead_159am).total_seconds()

3601.0

Start of Daylight Saving Time

from datetime import timezone, timedelta

EST = timezone(timedelta(hours=-5))
EDT = timezone(timedelta(hours=-4))

Start of Daylight Saving Time

spring_ahead_159am = spring_ahead_159am.replace(tzinfo = EST)
spring_ahead_159am.isoformat()

'2017-03-12T01:59:59-05:00'

spring_ahead_3am = spring_ahead_3am.replace(tzinfo = EDT)
spring_ahead_3am.isoformat()

'2017-03-12T03:00:00-04:00'

(spring_ahead_3am - spring_ahead_159am).seconds

Start of Daylight Saving Time

Using dateutil

# Import tz
from dateutil import tz

# Create eastern timezone
eastern = tz.gettz('America/New_York')

# 2017-03-12 01:59:59 in Eastern Time (EST)
spring_ahead_159am = datetime(2017, 3, 12, 1, 59, 59,
                              tzinfo = eastern)

# 2017-03-12 03:00:00 in Eastern Time (EDT)
spring_ahead_3am = datetime(2017, 3, 12, 3, 0, 0, 
                            tzinfo = eastern)

Daylight Saving

Working with Dates and Times in Python