1. Understand the timestamp
In Unix and Unix-like systems, timestamps usually refer to the number of seconds since 00:00:00 UTC on January 1, 1970, and this time point is also known as Epoch (Epoch). A timestamp is a long integer number that represents a specific point in time. Since the timestamp is in seconds, it can provide sufficient accuracy to meet the needs of most application scenarios.
2. Datetime module in Python
Python's datetime module provides rich date and time processing capabilities. It allows us to process dates and times programmatically, including addition and subtraction of dates, formatting and parsing of time, etc. When getting timestamps, we mainly focus on the datetime class and its now() method and the timestamp() method.
3. Get the current time
To get the current time, we can use the() method. This method returns a datetime object, representing the current date and time.
import datetime # Get the current timenow = ()
4. Convert to timestamp
Get the current timedatetimeAfter the object, we can usetimestamp()Method converts it to a timestamp. This method returns a floating point number, representing the number of seconds since Epoch.
# Convert to timestamptimestamp = ()
5. Only 10 digits are retained
becausetimestamp()The method returns a floating point number, which may contain the fractional part, while what we need is a second-level timestamp, that is, only the integer part. Therefore, we need to convert the floating point number into an integer to remove the fractional part.
# Only 10 digits are retainedtimestamp_10_digits = int(timestamp)
6. Complete code example
By integrating the above steps, we can get a complete code example to get the second-level timestamp of the current time.
import datetime # Get the current timenow = () # Convert to timestamptimestamp = () # Only 10 digits are retainedtimestamp_10_digits = int(timestamp) print(timestamp_10_digits)
7. Application scenarios of timestamps
Timestamps have many application scenarios in programming, and the following are some common examples:
- Logging: Record the time of events in the log file, which facilitates subsequent analysis and debugging.
- Database operations: Store data related to query time in the database, such as creation time, update time, etc.
- Time synchronization: In distributed systems, timestamps are used to synchronize time on different servers.
- Performance monitoring: Measure the time of code execution and analyze performance bottlenecks through timestamps.
8. Things to note
When using timestamps, you need to pay attention to the following points:
When using timestamps, you need to pay attention to the following points:
-
Time zone issues: By default,
()The local time is obtained. If UTC time is required, you can use it.()。 - Precision issues: Although timestamps are usually in seconds, in some high-precision scenarios, more precise units of time, such as milliseconds or microseconds, may be required.
- Overflow problem: Since the timestamp is a long integer number, it theoretically has an upper limit value. Although overflow problems are rarely encountered in practical applications, this is still necessary to consider when designing a system.
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