datetime_diff()

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Applies to: ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

Calculates the number of the specified periods between two datetime values.

Syntax

datetime_diff(period,datetime1,datetime2)

Learn more about syntax conventions.

Parameters

Possible values of period

These values are case insensitive:

• Year
• Quarter
• Month
• Week
• Day
• Hour
• Minute
• Second
• Millisecond
• Microsecond
• Nanosecond

Returns

Returns an integer that represents the amount of periods in the result of subtraction (datetime1 - datetime2).

Examples

The following example shows how to calculate the period between two datetime values with the datetime_diff function.

print
year = datetime_diff('year',datetime(2017-01-01),datetime(2000-12-31)),
quarter = datetime_diff('quarter',datetime(2017-07-01),datetime(2017-03-30)),
month = datetime_diff('month',datetime(2017-01-01),datetime(2015-12-30)),
week = datetime_diff('week',datetime(2017-10-29 00:00),datetime(2017-09-30 23:59)),
day = datetime_diff('day',datetime(2017-10-29 00:00),datetime(2017-09-30 23:59)),
hour = datetime_diff('hour',datetime(2017-10-31 01:00),datetime(2017-10-30 23:59)),
minute = datetime_diff('minute',datetime(2017-10-30 23:05:01),datetime(2017-10-30 23:00:59)),
second = datetime_diff('second',datetime(2017-10-30 23:00:10.100),datetime(2017-10-30 23:00:00.900)),
millisecond = datetime_diff('millisecond',datetime(2017-10-30 23:00:00.200100),datetime(2017-10-30 23:00:00.100900)),
microsecond = datetime_diff('microsecond',datetime(2017-10-30 23:00:00.1009001),datetime(2017-10-30 23:00:00.1008009)),
nanosecond = datetime_diff('nanosecond',datetime(2017-10-30 23:00:00.0000000),datetime(2017-10-30 23:00:00.0000007))

Output