如何使用Python计算结束时间与开始时间的时间差？

Hey there! Calculating the elapsed time between your two datetime strings is super straightforward in Python. Here's a step-by-step breakdown of how to do it:

Step 1: Parse the datetime strings into datetime objects #

First, we need to convert your raw string dates into Python's native datetime objects—since you can't subtract strings directly! We'll use the datetime.strptime() method, which lets us define a format string that matches your input structure.

Your datetime format is YYYYMMDD HH:MM:SS.sss, so the corresponding format code is %Y%m%d %H:%M:%S.%f.

Step 2: Compute the elapsed time #

Once we have the two datetime objects, simply subtract the start time from the end time to get a timedelta object, which represents the difference between the two times.

Full Code Example #

from datetime import datetime

# Your input datetime strings
start_date_time = "20200709 15:48:26.603"
end_date_time = "20200709 15:58:26.648"

# Define the format that matches your input
datetime_format = "%Y%m%d %H:%M:%S.%f"

# Parse the strings into datetime objects
start_dt = datetime.strptime(start_date_time, datetime_format)
end_dt = datetime.strptime(end_date_time, datetime_format)

# Calculate elapsed time
elapsed_time = end_dt - start_dt

# Print the formatted result
print(f"Elapsed Time: {elapsed_time}")
# Output: Elapsed Time: 0:10:00.045000

# If you need total seconds (including milliseconds) for calculations
print(f"Total Elapsed Seconds: {elapsed_time.total_seconds()}")
# Output: Total Elapsed Seconds: 600.045

Quick Notes #

• The timedelta object (elapsed_time) automatically formats the difference into hours:minutes:seconds.microseconds. In your case, it's 10 minutes and 45 milliseconds.
• Use .total_seconds() if you need the total elapsed time as a floating-point number—handy for numerical calculations.

内容的提问来源于stack exchange，提问作者mahendra