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pythontimestampntp
Charles Tucker 3
Charles Tucker 3

Reputation: 91

Converting NTP timestamp to datetime in Python

In Python, I have a 64bit floating point number representing a NTP time. I like to convert that in a readable format, e.g. a datetime object.

According to wikipedia the first 32 bit contain the time since 1970, and the last 32 bit are fractions of seconds, which I'm not interested in. However, as I have a float, not an int, how can I access the first 32 bit only? Bitshift doesn't work...

Upvotes: 0

Views: 2229

Answers (1)

CodeMonkey
CodeMonkey

Reputation: 23748

The ntplib python module has functions to convert from datetime timestamp to NTP timestamp and back.

import ntplib
from datetime import datetime, timezone

dt = datetime.now(timezone.utc).timestamp()
print("timestamp:", dt)

# convert datetime to NTP time
ntptime = ntplib.system_to_ntp_time(dt)
print("NTP time: ", ntptime)

# convert NTP time to datetime timestamp
ts = ntplib.ntp_to_system_time(ntptime)
print("timestamp:", ts)

# convert system timestamp to datetime
print("datetime:", datetime.fromtimestamp(ts))

# convert 1-Jan-1970 epoch datetime to NTP time
ntptime = ntplib.system_to_ntp_time(0)
print("\nNTP time: ", ntptime)
ts = ntplib.ntp_to_system_time(ntptime)
print("datetime:", datetime.fromtimestamp(ts, tz=timezone.utc))

Output:

timestamp: 1631063844.829307
NTP time:  3840052644.829307
timestamp: 1631063844.829307
datetime:  2021-09-08 01:17:24.829307+00:00

NTP time:  2208988800
datetime: 1970-01-01 00:00:00+00:00

Upvotes: 2

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