How precise should I encode a Unix Time?

How precise should I encode a Unix Time?

By : meena
Date : October 16 2020, 06:10 PM
will be helpful for those in need It depends on what the required precision of the time value is, and its maximal range.
When storing nanoseconds in an unsigned 64bit integer, the range is about 584 years (2^64 ns), so precise and long enough for any practical application already.
code :

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Oracle: Is there a way to encode a value using the unix crypt method?

Oracle: Is there a way to encode a value using the unix crypt method?

By : ADK
Date : March 29 2020, 07:55 AM
it helps some times Provided you are one Oracle8i or higher this is possible.
The solution is to write a Java Stored Procedure which can execute OS commands, and use that to run Unix crypt. Tim Hall's Oracle-Base site has an example of how to code one of these things. Find it here.
In Python, is time.time() * 1000 precise enough?

In Python, is time.time() * 1000 precise enough?

By : Ritesh Ranjan
Date : March 29 2020, 07:55 AM
I hope this helps . How much precision do you want? While it's true that there are finite decimal fractions that can't be represented as finite binary fractions, the nearest approximate value is going to round to the correct number of integer milliseconds as long as you aren't timing a program running for 143 millenia (2**52 milliseconds).
In short: I don't think you need to worry about floating-point precision for this. You might need to worry about system timer accuracy, precision, or monotonicity, though.
How precise is Go's time, really?

How precise is Go's time, really?

By : ben
Date : March 29 2020, 07:55 AM
around this issue Well as for the implementation, time.Now() falls back to a function implemented in the runtime. You can review the C time implementation and the implementation for time·now in assembly (linux amd64 in this case). This then uses clock_gettime, which provides nano seconds resolution. On windows, this is realized by calling GetSystemTimeAsFileTime, which too generates nanoseconds (not as high res but nanoseconds).
So yes, the resolution depends on the operating system and you can't expect it to be accurate on every OS but the developers are trying to make it as good as it can be. For example, in go1.0.3, time·now for FreeBSD used gettimeofday instead of clock_gettime, which only offers millisecond precision. You can see this by looking at the value stored in AX, as it is the syscall id. If you take a look at the referenced assembly, you can see that the ms value is mulitplied by 1000 to get the nanoseconds. However, this is fixed now.
fetching the precise date time including milliseconds the time photo is taken from image file in php

fetching the precise date time including milliseconds the time photo is taken from image file in php

By : Jeeva
Date : March 29 2020, 07:55 AM
I hope this helps . you should be able to get the millisecond/nanosecond resolution from the sub-second tags: SubsecTime, SubsecTimeOriginal or SubsecTimeDigitized, which are the array keys of the EXIF information.
Problem in converting local unix time to UTC unix time

Problem in converting local unix time to UTC unix time

By : user3017680
Date : March 29 2020, 07:55 AM
wish of those help I guess you're incorrectly transform datetimes with TZ information when converting the timestamp to datetime instance using time.strftime and after that datetime.strptime or when using mktime.
Anyway, there is much easier way to achieve what you want:
code :
from datetime import datetime, timezone

# Get current timestamp

now_timestamp = time.time()
>> 1563987839.054703

# Get datetime of that timestamp but already in UTC.
# This preserves TZ information and allows 
# to correctly do transition to the timestamp again.

utc_time = datetime.utcfromtimestamp(now_timestamp)
>> datetime.datetime(2019, 7, 24, 17, 3, 59, 54703)

# Convert UTC datetime back to timestamp

utc_timestamp = utc_time.timestamp()
>> 1563977039.054703

# Verify that this timestamp is indeed UTC
# I am in UTC+3 timezone now

>> datetime.datetime(2019, 7, 24, 20, 4, 10, 500229)

>> datetime.datetime(2019, 7, 24, 17, 3, 59, 54703)

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