The phrase "a time when services" is correct and usable in written English.
It can be used to refer to a specific period during which certain services were provided or available.
Example: "We will always remember a time when services were more personalized and customer-focused."
Alternatives: "an era when services" or "a period when services".
Several of the groups' directors said they had no choice but to turn more poor people away, at a time when services are in greater demand.
"At a time when services are being cut and people are losing jobs, a similar argument can be made in every state".
Many depend to an unhealthy degree either on sales taxes, which tax only goods at a time when services have grown to almost 60% of the economy, or on capital-gains taxes, at a time when stockmarket gains have disappeared.
"Three months later, the Business Secretary's dismissal of the sharp rise in share price as 'froth' has been demolished and increasingly it looks like the taxpayer has been left short-changed at a time when services are being cut and families are struggling with David Cameron's cost of living crisis.
"Increasingly it looks like the taxpayer has been left short-changed at a time when services are being cut and families are struggling with David Cameron's cost of living crisis.
Not only is it a case of acting after the horse has bolted, but the inspection industry is sucking value from the frontline at a time when services are under severe resource pressure.
But at a time when service has already not kept pace with the increases in ridership over the last few years, leaving many trains and buses overpacked, cuts are a topic that has become almost as taboo as higher fares.
On the one hand, austerity can create a 'perfect storm', with charitable donations decreasing at a time when service demands are increasing as many families and households struggle and need more support.
My vision is of a place and time when service by Jews, in a Jewish context, has become a rite of passage in and for the Jewish community, something that Jews are expected to do.
But this new initiative comes at a time when other services are swarming around trying to pick up the service / consultancy side of the startup market.
Moreover, you should also save contact information for people and businesses who claimed that your services weren't needed "at this time" since there may come a time when those services will be needed.
