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19 Dec 2025

MySQL provides three date and time types: DATE, DATETIME and TIMESTAMP: DATE only stores date; DATETIME stores fixed local time without time zone conversion; TIMESTAMP stores UTC and automatic time zone conversion, ranging from 1970–2038, and supports automatic initialization and update.

10 Nov 2025

Use shortcut keys to quickly insert date and time: Press Ctrl; insert the current date, Shift Ctrl: insert the current time. The combination of the two plus a space can input date and time at the same time; if you need to update automatically, you can use =TODAY() to display the date, and =NOW() to display the dynamic date and time.

03 Dec 2025

When converting separate date and time string columns to datetime type in Pandas, if the time column does not contain date information, pd.to_datetime will fill in the current system date by default, causing the date part to be changed unexpectedly. This article will introduce in detail how to correctly merge scattered date and time information into a complete datetime object through string splicing or the more recommended combination of date time and time difference to ensure the accuracy of data conversion.

02 Jan 2026

Java8 recommends using the java.time package: LocalDateTime.now() to get the local date and time (without time zone), ZonedDateTime.now() to get the date and time with time zone, and Instant.now() to get the UTC timestamp; avoid using the outdated Date and Calendar classes.

16 Nov 2025

Use the date() function to obtain the current date and time, for example, date('Y-m-dH:i:s') outputs 2025-04-0514:30:22; you need to use date_default_timezone_set('America/New_York') to set the time zone; the time() function obtains the Unix timestamp to ensure that the time is accurate.

21 Dec 2025

Java8's java.timeAPI provides thread-safe, immutable and intuitive date and time processing: LocalDateTime.now() to obtain local date and time, ZonedDateTime.now() or Instant.now() to handle time zone/UTC, and DateTimeFormatter to format output to avoid using outdated Date/Calendar classes.

15 Dec 2025

This article details how to accurately parse date strings containing time zone information and perform time zone conversion in PHP. By using DateTime objects, you can avoid possible deviations that strtotime may occur when processing such strings, achieve accurate initialization of date and time, time zone setting and formatted output, ensuring the robustness and accuracy of date and time processing.

27 Nov 2025

DateTime.Now gets the local date and time, DateTime.UtcNow gets the UTC time, you can use ToString() to format the output, the Today attribute gets the date, and TimeOfDay gets the time part.

05 Jan 2026

This article delves into common time zone confusion issues when dealing with date times in the JavaScript Date object in Node.js, specifically the 6-hour difference between local time and UTC time. We will clarify the internal mechanism of the Date object and provide solutions in two core scenarios: direct comparison when the database stores UTC time, and how to adjust when the UTC format string stored in the database needs to be parsed according to local time, aiming to help developers perform date and time comparisons correctly.