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The reason is because I'm making a script to work with ffmpeg and I need to be able to add/subtract time in the format 00:00:00[.000]
The last 3 digits are optional and they mean milliseconds. A time string could look like any of the following
4:34.234
5.000
2:99:34
4:14
This would be easier if a lot of the digits weren't optional. But since they are, I'm thinking I have to use some sort of regex to parse it?
254
How do you convert datetime to milliseconds? A simple solution is to get the timedelta object by finding the difference of the given datetime with Epoch time, i.e., midnight 1 January 1970. To obtain time in milliseconds, you can use the timedelta. total_seconds() * 1000 .
Multiply the timestamp of the datetime object by 1000 to convert it to milliseconds.
From string to milliseconds:
s = "4:34.234"
hours, minutes, seconds = (["0", "0"] + s.split(":"))[-3:]
hours = int(hours)
minutes = int(minutes)
seconds = float(seconds)
miliseconds = int(3600000 * hours + 60000 * minutes + 1000 * seconds)
From milliseonds to string:
hours, milliseconds = divmod(miliseconds, 3600000)
minutes, milliseconds = divmod(miliseconds, 60000)
seconds = float(milliseconds) / 1000
s = "%i:%02i:%06.3f" % (hours, minutes, seconds)
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