# date_trunc_ym(...)

### date_trunc_ym(...)

Truncates a calendar date at the year/month threshold

Works with the following datatypes:

This function works with 2.0 and 2.1 endpoint(s). What does this mean? »

The date_trunc_ym(...) function is used in the $select, $where, or $group parameters to truncate Floating Timestamps at the year and month level. For example, date_trunc_ym('2012-09-22T18:05:00.000') would result in new timestamp of '2012-09-01T00:00:00.000'. This is handy for aggregation & display usages. For example, to aggregate the Chicago Crimes dataset by month: https://data.cityofchicago.org/resource/6zsd-86xi.json?$select=date_trunc_ym(date) as month, count(*)&\$group=month