# Date-related macros The macros related to the date of the message (for example: `${ISODATE}`, `${HOUR}`, and so on) have three further variants each: * `S_` prefix, for example, `${S_DATE}`: The `${S_DATE}` macro represents the date found in the log message, that is, when the message was sent by the original application. Warning To use the `S_` macros, the `keep-timestamp()` option must be enabled (this is the default behavior of AxoSyslog). * `R_` prefix, for example, `${R_DATE}`: `${R_DATE}` is the date when AxoSyslog has received the message. * `C_` prefix, for example, `${C_DATE}`: `${C_DATE}` is the current date, that is when AxoSyslog processes the message and resolves the macro. The `${DATE}` macro equals the `${S_DATE}` macro. The values of the date-related macros are calculated using the original timezone information of the message. To convert it to a different timezone, use the `time-zone()` option. You can set the `time-zone()` option as a global option, or per destination. For sources, it applies only if the original message does not contain timezone information. Alternatively, you can modify the timezone of the message using timezone-specific rewrite rules. For details, see [Rewrite the timezone of a message](../../../docs/axosyslog-core/chapter-manipulating-messages/modifying-messages/rewrite-timezone/index.md). Converting the timezone changes the values of the following date-related macros (macros `MSEC` and `USEC` are not changed): * `AMPM` * `DATE` * `DAY` * `FULLDATE` * `HOUR` * `HOUR12` * `ISODATE` * `ISOWEEK` * `MIN` * `MONTH` * `MONTH_ABBREV` * `MONTH_NAME` * `MONTH_WEEK` * `SEC` * `STAMP` * `TZ` * `TZOFFSET` * `UNIXTIME` * `WEEK` * `WEEK_DAY` * `WEEK_DAY_ABBREV` * `WEEK_DAY_NAME` * `YEAR` * `YEAR_DAY` Last modified June 27, 2023: [Update paths to follow-up moving the files (6585a5b1)]()