def _timestamp_strftime(arg, format_str):
"""
Format timestamp according to the passed format string. Format string may
depend on backend, but we try to conform to ANSI strftime (e.g. Python
built-in datetime.strftime)
Parameters
----------
format_str : string
Returns
-------
formatted : string
"""
return _ops.Strftime(arg, format_str).to_expr()
def strftime(self, format_str: str) -> ir.StringValue:
"""Format timestamp according to `format_str`.
Format string may depend on the backend, but we try to conform to ANSI
`strftime`.
Parameters
----------
format_str
`strftime` format string
Returns
-------
StringValue
Formatted version of `arg`
"""
import ibis.expr.operations as ops
return ops.Strftime(self, format_str).to_expr()