Time Expression

Introduction

HertzBeat supports using expressions to calculate relative time during monitoring collection, allowing for more flexible time definitions in monitoring templates.

Syntax

${FORMATTER [{ + | - }<DURATION> <TIME_UNIT>]}

• FORMATTER: Determines the format of the expression's result
• DURATION: Size of the time period, a positive integer
• TIME_UNIT: Unit of the time period

Supported Formatting Types

Example outputs are based on the current time being 2022-04-24 02:40:00.123

Name	Description	Example
@now	Formats as yyyy-MM-dd HH:mm:ss	2022-04-24 02:40:00
@date	Formats as yyyy-MM-dd	2022-04-24
@timestamp10	Returns 10-digit timestamp	1650768000
@timestamp	Returns 13-digit timestamp	1650768000000
@time	Formats as HH:mm:ss	02:40:00
@year	Formats as yyyy	2022
@month	Formats as MM	04
@day	Formats as dd	24
@hour	Formats as HH	02
@minute	Formats as mm	40
@millisecond	Formats as SSS	123
@second	Formats as ss	00

Supported Time Units

Name	Description
y	Year
M	Month
d	Day
H	Hour
m	Minute
s	Second
w	Week

Where to Use

• Request parameters for HTTP protocol monitoring types

Usage Examples

1. Simple expression
   • ${now} gets the current time and formats it as yyyy-MM-dd HH:mm:ss
   • ${time+1h} calculates the time one hour from now and formats it as HH:mm:ss
   • ${time+1h+15s+30s} calculates the time one hour, 15 minutes, and 30 seconds from now and formats it as HH:mm:ss
2. Complex expression template (if the built-in formatter does not meet your needs, you can combine multiple expressions)
   • ${@year}年${@month}月${@day}日 returns the current date formatted as yyyy年MM月dd日